Question

The average of the present age of 'A' and 'B' is 40 years. If the ratio between the age of 'A' 5 years ago to the age of 'B' 5 years hence is 3:5, then find the age of 'B' 10 years hence.

A 35 yrs
B 42 yrs
C 79 yrs
D 55 yrs
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