A) 9
B) 10
C) 11
D) 12
Correct Answer: D
Solution :
Average of A, Band C = 10 years A + B + C = 30 yr. Now, (A + C) + B = 30 yr. 18 + B = 30 B = 30 ? 18 = 12 yrs.You need to login to perform this action.
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