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Deepak is 4 times as old as his son. four years hence the sum of their ages will be 43 years. How old is deepak's son now?

5 years
7 years
8 years
10 years

Correct Answer: 7 years

Explanation:

Let the son's present age be x years
Then, (x + 4 ) + (4x + 4) = 43
⇒ 5x = 35
⇒ x = 7 years

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