Question

what is Aman's present age, it after will be 10 times his 20years his age age 10 year back?A) 6.2
B) 7.7
c)13.3
d)10​

Answer 1

Consider Aman's present age to be 'x'

After 20 years his age will be 'x + 20′

Aman's age 10 years ago was 'x-10'.

So now,

After 20 years his age will be 10 times his age 10 years back.. which is,

(x + 20)= 10 * (x-10)

x + 20 = 10x - 100

100 + 20 = 10x - x

120 = 9x

x = 120/9

x = 13.33

So Aman is 13 years and 4 months old now.

So the answer is C i.e 13.3