Answer :
Let the Manoj’s present age be x yr.
Then, Manoj’s age after 20 yr = (x + 20) yr.
It is given that after 20 yr, Manoj’s age will be 5 times his present age.
Therefore, the equation is x + 20 = 5x
⇒ 20 = 5x – x
⇒ 20 = 4x
⇒ [Divide by 4 both sides]
⇒ 5 = x
Hence, the present age of Manoj is 5 yrs.
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