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

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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

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Mike McGarry, Magoosh Tutor