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Last Updated on May 4, 2023
GMAT OFFICIAL GUIDE PS
Solution:
We are given that 30 percent of the members of the have passed the lifesaving test. If we use variable T for the total number of members, we can say:
0.3T = number of members who passed the test
Since we know that 0.3T is the number of members who passed the test, we can determine that 0.7T members did not pass the test. Next we are given that among the members who have not passed the test, 12 have taken the preparatory course and 30 have not taken the course. With this information we can set up the following equation:
12 + 30 = 0.7T
42 = 0.7T
420 = 7T
60 = T
Thus, there are 60 members in the swim club.
Answer: A
