A total of 120 investment advisors work at a particular financial services firm, 30 in bonds and the rest inequities.

[Gmat_mission]

A total of 120 investment advisors work at a particular financial services firm, 30 in bonds and the rest inequities. Fifty percent of the investment advisors are board-certified. If one-third of the equities advisors are board-certified, how many bonds advisors are not board-certified?

A. 0
B. 10
C. 15
D. 20
E. 30

[spoiler]OA=A[/spoiler]

Source: Princeton Review

[RaghavKhanna]

Total = 120
Bonds = 30
Equities = 90

Board-certified = 50% of 120 = 60

No. of equities advisors who are board-certified = (1/3) * 90 = 30
=> No. of bond advisors who are board-certified = 30

=> No. of bond advisors who are board-certified = 30 - 30 = 0

[Scott@TargetTestPrep]

A total of 120 investment advisors work at a particular financial services firm, 30 in bonds and the rest inequities. Fifty percent of the investment advisors are board-certified. If one-third of the equities advisors are board-certified, how many bonds advisors are not board-certified?

A. 0
B. 10
C. 15
D. 20
E. 30

[spoiler]OA=A[/spoiler]

Solution:

We see that 120 x 0.5 = 60 of the advisors are board-certified, and 90 advisors are in equities.

Thus, 90 x (1/3) = 30 of the equities advisors are board-certified, so all 30 of the bonds advisors are board-certified, so there are zero bonds advisors who are not board-certified.

Answer: A