1.

1). 7.12). 19.673). 194). 29.5

Answer»

The average age of A and B = 20 years

The SUM of age of A and B = 20 × 2 = 40 years

The average age of B and C =18 years

The sum of age of B and C = 18 × 2 = 36 years

The average age of A and C = 21 years

The sum of age of A and C = 21 × 2 = 42 years

The sum of age of A + B + C = (A + B + B + C + A + C) = 40 + 36 + 42 = 118

⇒ 2(A + B + C) = 118

⇒ (A + B + C) = 59

Average of A + B + C = 59/3 = 19.67



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