Bunuel wrote:

If Jason was 34 years old 8 years ago and Lester was 27 years old 5 years ago, what was the average (arithmetic mean) of their ages x years ago?

A. x + 37

B. 37 – x

C. 61/2 + x

D. 32 – x

E. 35 + x

Since Jason was 34 years old, 8 years ago, his current age is 42

Similarly, sine Lester was 27 years old, 5 years ago, his current age is 32.

Hence, the average of their ages is \(\frac{42+32}{2}\) or 37.

Hence, their average(x years ago) was 37-x(Option B)

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