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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