GMAT Data Sufficiency Practice Questions | DS Tutorials | 5 GMAT Sample Questions

[@chiragprajapati4410]

I never thought DS could be explained a simple and concrete manner like this. Thanks for boosting my confidence

[@Wizako]

Glad it was helpful!

[@SnigdhaPankaj-d5k]

Absolutely Amazing. Thank you so much sir

[@Wizako]

You are welcome! Good luck with your prep.

[@ravisharma772]

Awesome content! Never thought DS can be explained so beautifully! Kudos to you :)

[@Wizako]

Thanks Ravi for your feedback. December is 'data sufficiency' month. Everything that we do is DS related. Please check community tab of the channel where new questions get posted. Video explanations are posted a day or two later. A DS challenge is currently underway. I invite to participate in it. You can click here to get to the community tab kzbin.infocommunity The playlist on DS has about 20 videos. Watch them to solve a wide variety of questions. kzbin.info/aero/PL3JsYBL14ZluhkLn70KBoVkDbmFpsRC2G Cheers

[@souviksarkar6041]

Thank you sir. Very helpful

[@murthyicar20]

Awesome explanation!!! sir

[@Wizako]

Thanks Kittu. Appreciate the feedback. DS is the fear factor for many GMAT aspirants. But it is not as big a demon as many people perceive it to be. If you work on strengthening your fundamentals and on learning the right approach to the DS questions, you will be perfectly fine! Be sure to check out the rest of the Data Sufficiency videos at kzbin.info/aero/PL3JsYBL14ZluhkLn70KBoVkDbmFpsRC2G You can also sign up as a trial user at wzko.in/core to begin work on the fundamentals!

[@gksays4814]

Respect.... Keep up the good work.

[@Wizako]

Thanks GK for your feedback.

[@paolamarquezgarrido2508]

you are the best, thank you so much!

[@Wizako]

Hello Paola, Thank you very much! Best wishes for your GMAT Prep

[@비또-c2c]

Thank you for the clear explanation!

[@jasmineaimu3567]

please make more content about DS !! i'm in indonesia and in here, the university entrance examination is the mix of GMAT & SAT.. anyway stay safe..

[@Wizako]

Hello Jasmine The following playlist has over 25 GMAT DS practice questions. kzbin.info/aero/PL3JsYBL14ZluhkLn70KBoVkDbmFpsRC2G Best wishes for your university entrance exam. Stay safe; stay healthy; stay motivated.

[@freddytang2128]

for question 4, I solved it by skipping the complicated algebra. I plugged in X equals 3.9 and it satisfied both conditions, so I know both conditions alone cannot determine if X is 3, there is another possibility

[@joyfulmercy7]

Sir, in the third question, if y is real y^2 can’t be negative then that makes X=3 and not X=-3 as per your explanation when the two statements are combined. But, if the second statement itself is giving the answer as X=3 then the answer should be B? Kindly explain where I made a mistake?

[@Wizako]

Hello Mercy, In the above example, if the value of y^2 is root(21), we can trace x=3. However y^2 can take n number of values. Therefore, we are unable to deduce that x is definitely equal to three. For example, if y^2 = root(28), x turns out to be 4. There is not a specific condition for the exact value of y. I hope that I have answered your question. Best wishes for your GMAT Prep!

[@joyfulmercy7]

Wizako thank you Sir.

[@sagemulkey9890]

Last question (question 4) How do you know x lies between 0 and 3 based off .....x(x-3)

[@Bloo_M]

If X is negative, x(x-3) would be a product of two negative numbers, which would make it positive and thus greater than 0, so x has to be greater than 0. If it is equal or greater than 3 you always have a product of two positive numbers, so it's also positive

[@aditimittal6091]

Sir, one question. In question 4, statement 1, won't the solution of X(X-4)< 0 be X

[@Wizako]

No Aditi. The product of x and (x - 4) is negative when one of the numbers is negative and the other is positive. The possibility of x being negative and (x - 4) being positive is illogical. So, x will be positive and (x - 4) will be negative. The solution finally becomes 0 < x < 4. Cheers

[@Sikshasabkeliye]

A small explanation in question 3? If y is real also... Then also why it not choose other positive value.... As in why it stick to (/_21)...as statement 1 and 2 are individual statement

[@Wizako]

We have combined the statements to arrive at the answer as all other options didn't yield a unique answer, i.e. x = 3. When we evaluated both statements together, we found that as x = +3 or -3 (from statement 1). From statement 2: y^2 cannot be a negative value. Hence y^2/7 cannot also be a negative value. Since y^2/7 is equal to x, and we also found out that x can be +3 or -3 before, we conclude that x is a positive 3 now (which we are required to prove). So statements together are sufficient to answer the question.