A, B, C, D, are four friends. Average age of A and C is 35 years and that of B, and D is 40 years. Average age of B, C and D is 40 years. The sum of the ages of A and D is equal to that of B and C. Find out the ages (in years) of A, B, C and D. A, B, C, D
Answer : Option C
Explanation : A + C = 70 years
B + D = 80 years
B + C + D = 120 years
∴ C= 40 years and A = 30 years
A + D = B + C
or,30 + D = B + 40
or,D – B = 10
∴ B = 35 years and D = 45 years
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