Question

7. 21 years from now, I will be 4 times as old as my present age. My present age is
(a)6
(b)7
(c) 8
(d) none.
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Answer 1

Let the present age be X.

x+21=4x

21=3x

Therefore x=7.

Answer 2

Step-by-step explanation:

let my present age be x

so, my age after 21 years= x+21

and i will be 4 times of my age =4x

so, my present age

=(x+21)=4x

=21=3x

=21/3=x

=7=x

the correct answer is b