Quantitative Aptitude :: Problems on Ages - Discussion

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Explanation:
P = 2*(P + Q+ R)/3 --------(1)
Q = (1/2)*(P + Q+ R)/3 ------- (2)
and R = 5 -----------(3)
By solve the above equations,
=> P = 20, Q = 5 and R = 5
Sum of their ages = P+Q+R = 20 + 5 + 5 = 30 years.