TCS Company Numerical Ability Age Problem

A man is 37 yrs old and his two sons are 8 yrs and 3 yrs old. After how many years will he be twice as old as sum of the ages of his sons?

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TCS Other Question

The price of an article is discounted by 30% there by its sales is increased by 40%. What is the profit or loss percent? By selling 32 books for Rs. 100/- a man loses 40%. How many books shall he sell for Rs. 100/- to gain 20%?