Les needs to shave off three hundredths of a 4 inches steel bar. How many inches will he shave off?

[@vanderpoolfarmsl.l.c.9983]

John's machining word problems are always haywire. When it comes to writing story problems, "MANY WILL GET IT WRONG"!!

[@bubbyp7741]

As a machinist, the wording is tricky in the question. I would machine .030 or 30 thousandths not .030 off every inch

[@keithmills778]

As a non-machinist, I was going to say something like that. If somebody says they need to shave off a couple thou, they mean that they need to shave two thousandths (0.002) off the entire piece. It’s an actual measure of what comes off; it’s not a proportion.

[@227110703]

As a math problem , it's the right answer. As a machinist, your removing 3/100 of an inch.

[@troymckoy113]

I said the same thing. Shave .03 inch per each inch or .03 inch from the top of the bar? The problem is not specific enough. It made me think though.

[@vanderpoolfarmsl.l.c.9983]

John is NOT a machinist!

[@GaryBricaultLive]

Sorry but it was 3/100's as a percentage of the total length of the bar and not 3/100 of an inch. It is a poorly worded problem that had me fooled in the beginning.

[@anncook2727]

3/25 is equal 12/100

[@dksaevs]

I had to read it twice... it says per 4" and as a machinist we think per 1". so while John it right, in the real world no one would state the problem that way

[@JeffYoung-e5v]

As a person who has worked in construction; fabrication and machining I get irritated at how text book questions are phrased. I understand that they wish to ask "real world" questions, but sometimes they come across as odd. Three hundredths is a measurement, so it could be argued that is how much Les is supposed to "shave off". Also, It doesn't say which face of the bar, it could need it from the long side etc...

[@richardowens9061]

I get your point - really, I do. But, we are only given one dimension - 4 inches. So, it is simple arithmetic - 4 inches x 0.03 = 0.12 inches. Converted to fractions, rather than decimal, gives us 12/100 of an inch, simplified to 3/25 (which, of course, is an odd fraction and not one found on a ruler, measuring tape, or even a caliper). This is just what you're going to get when a mathematician writes a word problem about an engineering task.

[@jeffyoung8047]

Right , we get the spirit of the question even if it makes us chuckle a little bit. Good stuff!:)@@richardowens9061

[@sbrunner69]

Three hundredths is not a measurement unless units are given, otherwise it’s just a fraction (or decimal) number.

[@kevinphanson]

.03 x 4 = .12 Why does it take 10 minutes to figure that out???

[@rogeraffleck8677]

Anybody who considers this problem to be misleading or ambiguous has never learned how to read.

[@dhobonov]

Yep!

[@Geoff_G]

3/100 = 0.03" will be shaved off. Ask any machinist or engineer this question, and you will get this answer.

[@GaryBricaultLive]

Sorry but it was 3/100's from the total length of the bar and not 3/100 of an inch. It is a poorly worded problem that had me fooled in the beginning.

[@Geoff_G]

@GaryBricaultLive if you tell any machinist or engineer to remove 3/100 or 3/1000 or 3/10000 it is understood to mean "of an inch". Every. Single. Time. You're right it was poorly worded if he expected anything other than how I and many others interpreted it.

[@richardfrankham7522]

Terribly worded question. Of or off? Three hundredths of a what? An inch? Three hundredths of the bar?

[@stevenflogerzi1955]

In manufacturing the terms like take off 3 hundredth's or 3 thousandth's would be implied " of an inch " so your wording made it vague. If you said take off 3 hundredth's of the total length of a 4 inch bar would remove the vague statement. :)

[@Briarbuddy]

I totally agree.

[@marknesselhaus4376]

Yup, that is how I see it.

[@Bluuplanet]

He's shaving off .03 of the total bar length, not .03 of an inch. So, he's going to shorten the bar by a bit under an eighth inch... .120 to be exact.

[@advancedautomotivemachine4791]

The machinist in me came up with .120" Which is the same as 3/25"

[@olenfersoi8887]

I hope this is trick language...because in real life no-one would ever talk like that: If someone were being giving instructions, it would be specified that it was 3 hundredths of an inch to be shaved off...or 3% of the total thickness of the block. so the answer is .03 of an inch. Instructions would never be stated simply as 3 hundredth. Now, having seen your answer, I see that it is total BS because, again, if someone were being told to shave off 3% of the total thickness off of a block that would be the language...or 12 hundredths or 3/25ths of an inch. In fact the language would almost certainly be 120 thousandths. It would NEVER be 3 hundredths without being told hundredths of what. If this is your way of testing whether the listener knows a whole is generally considered to have 100 parts, or 100%, it's a poor way of doing it....and, for that matter, you would never award 200% for a completely correct answer! An answer can be less than 100% correct. But, aside for extra credit for extra work, the answer itself can never be more than right.

[@lizardfirefighter110]

3 one hundredths from 4 inches equals 3 inches and 97 hundredths. That is a fact and this answers the question. It does not mater how thick something is, if you remove 3 hundredths then the original prince will be less by 3 hundredths. Or you can ask what is 3 hundredths of 4 inches. But you did not….

[@dhobonov]

I agree with you. The problem literally says three hundrenths OF a four inch bar so...

[@darellpiper7227]

As a Professional Engineer, I say the answer is 0.03 inches. I will watch your explanation, but in the real world. My answer stands.

[@richardl6751]

Also 3% of 4 inches equals 0.12 inch.

[@darellpiper7227]

John, talk to a real Engineer or a real Machinist. They will give you a different answer than yours.

[@BlackhawkPilot]

A machinist does not work with fractions only decimal numbers.

[@kennethwright870]

.03*4” = .12”

[@tesladan7873]

I’m also a machinist for over 40 years and I would have taken .030” off the bar. John obviously is not a machinist. In addition to him not knowing how trades people talk about machining, but most machinists talk in terms of “thousands” of an inch, 30 thousands of an inch would of been removed from the block of steel. Why do I say that? Because (as every machinist knows) the machines are graduated in thousands of an inch, not “hundreds” of an inch

[@bobdear5160]

I would advise Les to query the request to remove all the ambiguities. Three hundreds as a length is 0.03”; three hundreds off every inch of a 4 inch bar is 4 x .03 or .12”; three hundreds off the width of a bar 4” long decreases the (unknown) width by 0.03” and leaves the length unchanged at 4”. I did like the idea of taking .03 off the radius and decreasing the diameter by .06!

[@dksaevs]

In the real world measurements are in x/1". Upon first read i missed the per 4" BECAUSE NO ENGINEER WOULD WRITE IT DOWN LIKE THAT!!! IT WOULD HAVE BEEN WITTEN AS: Remove 3 hundreds of an inch (0.03) per inch of thickness 4" . .03 * 4 = .12

[@lowellmccormick6991]

In inches, 4" x .03=.12" which is just under 1/8" (.125"). Or in decimal feet (my preferred method) .3333' x .03 = .01' which is just under 1/8" (.0104'). If I gave my steel fab shop guys or my machinist a measurement of 3/25", he'd think that I had no clue what I was doing. What tool would you measure 3/25" with?

[@buddyroeginocchio9105]

Just a convention note; a machinist could of course cut 3/25 of an inch off however that is an unconventional communication for machinists, they would for the sake of clear understanding remove .120 inches.

[@devonwilson5776]

Greetings. The answer is 3/25 inches. We determine the answer by. multiplying 4 by 3/100 to get 4×3/100= (4×3)/(4×25)=3/25 inches.

[@stephensharma4994]

you know ,,, man ,, even thou i went to university ,,,sometimes i do learn a thing or two from you .... cool !!

[@glengreen362]

I haven't watched the video yet, but the description of the bar is inadequate to calculate the equation. What exactly are the dimension of the bar? Is the bar a 4 inch cube, a 4 inch diameter round bar, or is the 4inches simply one dimension of one side of the bar. Moreover, how long is the bar, and is that area to be ct off to be from the end, top or side of the bar? I just thought of another twist. How about 300ths of a chamfer on one edge of the bar. But seriously, make the equation taking 3000ths off from a 4" x 4" x 12' bar with the area to be removed coming from the top width of the bar.

[@Soliton19]

This question is an example of the worst kind of garbage math question possible, it completely ignores proper terminology. Shaving off a 4 inch steel bar has a shaving length of 4 inches as a shaving is a continuous strip removal, the depth of the shaving is 3/100 of an inch. Please rephrase the question so it makes sense and is not ambiguous, be exact in your terminology and state clearly what you are asking for.

[@77redmax77redmax]

3 hundredth of 4 = 3/100 of 4 3/25 =•12

[@footfrek]

The answer probably should have read as 12 hundredths of an inch. 3/25 is not a practical way to read inches. It did not at any time ask you to shave 3 hundredths of an inch. A lot of us are looking at this from a practical / real world stand point and not as just a math problem. this is the rest why he says to read the problem multiple times. If you handed this straight to a machinist he is probably going to assume business as usual an shave .03 in off the bar.

[@malcolmbrewis5582]

Upon your concluding another session of engaging conversation, an advert interrupted and began before you could return to the problem proper. Considering KZbin's increased propensity to insert advertis, perhaps you could consider the possibility of reducing the amount of engaging though tangential conversation. If only KZbin would limit adverts to entertainment videos and allow academic and informative videos to run without distractions.

[@terry_willis]

Try adding the extension "Adblocker Plus" or "Ad Blocker for KZbin" to stop youtube ads. (Used with Firefox). KZbin has been trying to circumvent these ad blocker extensions recently, but the blockers still seem to work OK.

[@StephenRayWesley]

4\300=√™75 3^√25 3^5 (x+3x-5)

[@_Aardvark_]

Its the 21st centuary, teach the metric system.

[@terry_willis]

It didn't work last century either.

[@_Aardvark_]

@@terry_willis Touché Terry.

[@dhobonov]

Actually, the imperial system will come in handy if one travels to Liberia or Burma.

[@paulhaye]

0.12 inches.

[@disraelidemon]

Three hundredths of a four inch bar is three percent of the bar. Each of the four inches is 25 percent of the bar. Therefore the answer is 3/25 inches.

[@markbernier8434]

Have to admit, my first thought was remove 0.03". then I realized you meant reduce by 3%.

[@davidbetz5278]

Well in the machinist world you would shave off precisely .300".

[@stevenfisher5320]

Don’t say “prah-em” when you are hurrying through the word “problem!”

[@lukeknowles5700]

I don't know, but Les will most certainly dull his razor.🤣

[@terry_willis]

I got the correct answer but I used an HP scientific calculator. Do I have to stand in the corner??

[@spencerosei2616]

0.03 x 4= 0.12 inches no calculator needed.

[@tomtke7351]

is 3-hundredths 0.03" or 3% A S S U M E 3-hundredths = 3/100 = 3% 4inches = 16×4 = 64/16 inches (64/16)×(0.03) (64×3/16×3)(0.03) (192/16)(0.01) 1.92/16 ~1/8"

[@ItsVideos]

They are the same.🙂

[@tomtke7351]

@@ItsVideos not

[@ItsVideos]

@@tomtke7351 Good luck.

[@jeffreyabelson7171]

.12 = 3/25ths

[@SuperRealityKid]

A poorly worded question. If you "turn off" 3/100" off a circular bar, you will lose 6/100". The more times you read the question, the more options there are, all generated by what the questioner meant by "shaving off".

[@guidosarducci1943]

3.700 in in a tool room

[@normrussell4346]

300's of an inch.

[@stephensharma4994]

hey good one ... the wording got me here... !!

[@russelllomando8460]

great explanation. thanks.

[@GaryBricaultLive]

Yes again another poorly worded problem. The question being asked is to remove 3/100's as a part of the total length of the bar and not just 3/100 of an inch.

[@johnszablak9283]

You can shave a beard... Not a steel bar. This is like saying I own a chainsaw with a 16 blade. Bar None!

[@Rawsz-jk2rn]

Answer…. Not very much! 😂

[@davidbarnes9306]

Go decimal.

[@bierbarrel]

4,5 feet

[@harikrishna69]

Americans! They make things so difficult for themselves. And this an arithmetic problem. Not Mathematics.

[@eric4709]

This doesn't sit right with me. Practically ... ( as the question seems to be more "practical than mathematical") .... surely - anyone machining a steel bar is working to a given dimension or specification - taking regular measurements in absolute terms to ensure the required accuracy of the finished work. Talking in terms of "hundredths" - or indeed percentages merely confuses things ! - see below Just make the measurement and work to that! ( and ...also working to a required tolerance sufficient to meet the required accuracy of measurement to two decimal places as implied in this case ) Simply saying the bar is "4in" isn't really sufficient and surely should be quoted at least to 4.000 +/- x inches if one is working reliably to the nearest 0.01in as implied ie say measuring 4.000in to +/- 0.005 in So one would , in this case, measure the steel bar being machined - and indeed if found still oversize by "x" amount - then working with / removing that absolute amount that needs to be removed !! I really cant see anyone converting that "x" to "hundredths" ( or indeed to a %'d) - why would you bother?? - However - as far as this question is concerned : You COULD ask: - Les is machining a length of rectangular steel bar to a required length . During this process Les measures the length to be currently 4.000 inches. However - it is found that the bar is still 3/100 of 4.000in oversize. ( NOTE : "of 4.000" ... NOT "3% or 3/100 oversize" !!! this would imply that the bar is 3% over the "finished size" - NOT 3% of the current size of 4.000 in" - which would mean - 4.000 would represent 1.03x where x would be afinished size of 3.8835in not 3.880 as shown ) Question 1. How much more does Les have to cut off to meet the required finished length ? ( give answer to three decimal places **) Question 2. What is the final specified length ( give answer to three decimal places. ** ) ( ** ignore tolerancing etc / accuracy of measurement to keep it simple) Of course - this would give 1 : 4.000in * 0.03 = 0.120 in, and 2: 4.000in - 0.120in = 3.880in

[@patriciagreen2365]

12/100 = 3/25

[@Mrskateboardboy]

3/25ths

[@saltydog584]

0.3048 centimetres

[@douglassmith8334]

Very poorly (typical,) worded question. People who get these wrong are simply working on poor specifications. Not fair.

[@mylittlepitbull3143]

$1 million