Question

the ratio of ages a two persons 7:11. 7yrs hence,the ratio of their ages will
let the ratio be =x
1st person=7x
2nd person =11x
A/Q
7x+7/11x+7=2/3
=21x+21=22x+14
=21x-22x=14-21
= -x=-7
=x=7
first person =7x
7x7
49 yrs
2nd person=11x
11x7=77yrs​

Answer 1

Step-by-step explanation:

Let father age is 7x

And son age is 2x

then after 15 year father age is 7x+15

After 15 year son age is 2x+15

⇒

2x+15

7x+15

=

1

2

⇒4x+30=7x+15

⇒4x−7x=15−30

⇒−3x=−15⇒x=5

Hence father present age=7×5=35

Son present age=2×5=10

difference of father and son age=35−10=25

So father age was 25 years when son was born