Question

answer question no 13

Answer 1

Let Keerti's age be x
So, Devi's age is 5x

Then x+5/5x+5 = 1/3
⇒3x +15 = 5x + 5
⇒x = 5

∴ Keerti's age is 5 and Devi's age is 5x = 25

Answer 2

let the at present
Keerthi age = x yrs
devi age = 5x yrs

after 5 yrs
---------------
Keerti age = (x+5) yrs
devi age = (5x+5) yrs

ratio devi and keerti of the ages = 3:1

(5x+5) /((x+5) = 3/1
5x+5 = 3(x+5)
5x+5 = 3x+15
5x-3x= 15-5
2x=10
x= 10/2
x= 5
therefore
at present
keerti age= x =5 yrs
devi age = 5x = 5*5 =25 yrs