Source: Official Guide for the GMAT 13th Ed. Problem Solving; #189 Official Guide for the GMAT 2015 14th Ed. Problem Solving; #189

1

Thirty percent of the members of a

Thirty percent of the members of a swim club have passed the lifesaving test. Among the members who have not passed the test, 12 have taken the preparatory course and 30 have not taken the course. How many members are there in the swim club?

2 Explanations

1

Pariya Mahmoudi

I could solve it with inputing answer choices in the 30%x and then adding up all the members to see if it equals the answer choice I inputed.
For example:
30/100 (60)= 18
18+12+30=60
So, A is correct.

Let's try choice B

30/100 (80)= 24
24+12+30= 66
So, it's wrong

Jan 22, 2016 • Comment

Cydney Seigerman, Magoosh Tutor

Thanks for sharing an alternative solution! :)

Jan 22, 2016 • Reply

1

Gravatar Mike McGarry, Magoosh Tutor

Dec 28, 2013 • Comment

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Section 5.3 Problem Solving

Section 5.3 Problem Solving

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