Kalam's age after 15 years will be 5 times his age 5 years back. What is the present age of Kalam?

5 years

10 years

20 years

25 years

Let Kalam's present age be x years. Then Kalam's age 15 years = (x+15) years. Kalam's age 5 years back = (x-5) years. Therefore, x+15=5(x-5) => x+15= 5x-25 => 4x=40 => x=10.

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