Bunuel wrote:
To Ell a larger concert hall, a madrigal singing group consisting of sopranos, altos, and basses, in a 5:7:3 ratio, needs 40 singers. What is the least number of basses the group will need?
A. 8
B. 9
C. 10
D. 11
E. 12
For the madrigal singing group in the ratio to have a ratio of 5:7:3(S:A:B),
for every 3x basses, there are 12x sopranos and altos. Since we need the
least number of basses
15x(3x + 12x) > 40 or x > 2.66. The minimum value of x is 3
Therefore, the least number of basses the group will need is 3x or
9(Option B)
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38% (02:11) correct 
