GMAT 700 Level Data Sufficiency | Rates | Work Time Sample Question | GMAT Online Preparation

[@pratikmodi1838]

Brilliant question , The trap is very tempting but got to be very clear with the basic understanding of the concept .

[@amitra29877]

Awesome question and explanation Sir

[@aanchalnayyar8973]

Had the question asked for the least efficient in that case, both statements together also would not have been sufficient?

[@Wizako]

Yes that's absolutely right Aanchal!! Best wishes for your GMAT Prep!

[@sharmistha19]

But there might be a chance that p+r =15 (i.e. p can be 12 n r can be 3 or vice versa of p can be 13 or r can be 2 ) so if we compare in this scenario then p or r can be more efficient than q. Please suggest

[@Wizako]

But we cannot finalise on an option if the value is not unique. By your method, either p or r can be the most efficient system. We need to be sure of an option, before choosing an answer.

[@aparupduke]

@@Wizako based on that logic we cant be sure of the above mentioned process either, hence the correct option chosen should have been E

[@namrajsharma6]

​@@aparupdukeYes, correct answer is E