Bunuel wrote:

The quantities S and T are positive and are related by the equation S=K/T, where k is a constant. If the value of S increases by 50 percent, then the value of T decreases by what percent?

A. 25%

B. 33 ¹/₃%

C. 50%

D. 66 ²/₃%

E. 75%

We can assign numbers:

lets say S = 2, K = 6 (constant) and T = 3 (so that S=K/T)

Now increasing S by 50% gives S=3, K remains constant, so T = 2 (6/2=3)

decrease in T= 1, percent decrease in T = (1/3)*100 = 33.33%

Answer B

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