GMAT Math

Hi OptinumGMAT,

To start, when posting GMAT questions, you should make sure to post the ENTIRE question (along with the answer choices). This question can be solved rather easily by TESTing THE ANSWERS, but since you have not included them, you're forcing everyone to approach this question algebraically.

GMAT assassins aren't born, they're made,
Rich

Here's the question, Rich:


Here's the video solution:
https://www.gmatprepnow.com/module/gmat ... video/1072

Cheers,
Brent

Hi OptinumGMAT,

This question is essentially a 'lift' of an OG question:

OG13/GMAT2015 pg. 154, #15
GMAT2016 pg. 154, #19

Both the OG question and this question can be solved by TESTing THE ANSWERS. Here's how:

Since we're adding two considerably smaller fractions to 1/3, you don't actually have to add those fractions up to know that the total fraction can't be much more than about a half. With that deduction, the remaining 30 students represent approximately half of the total students. Since the question asks for the total number of students, the correct answer is likely either A or B. Under typical circumstances, we would start by TESTing either Answer B or D first, so I'll start with B.

Answer B: 72 students

IF....there were 72 students....
(1/3)(72) = 24 are Jets fans
(1/6)(72) = 12 are Bears fans
(1/12)(72) = 6 are Raiders fans

24+12+6 = 42 fans accounted for. That leaves...

72 - 42 = 30 fans left. 30 is an exact MATCH for what we were told, so this MUST be the answer.

Final Answer: B

GMAT assassins aren't born, they're made,
Rich

[email protected] wrote: This question is essentially a 'lift' of an OG question:

If you're suggesting that word problems featuring information about fractions of a population and additional information about the remaining members of that population are solely the domain of the GMAT, you might want to take a look at any elementary math textbook on the planet.