Infosys Company Numerical Ability Age Problem

The age of the father is 18 years older to his son. After 5 years fathers age becomes thrice of his son, What is fathers present age.

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Infosys Other Question

Complete the series. 4, -5, 11, -14, 22, ---
Two numbers 1361, 1468 when divided by certain number leaves remainder 7,11 respectively. Find the Number