Answer:

Okay let’s solve this problem step by step :

Let- age of his sister be x.

So, the age of Arvind will be = x+8

After 3 years

The age of his sister =x+3

The age of Arvind =x+8+3

=x+11=2[x+3]

EQUATION-

=> 2[x+3] = x+11

=> 2x+6 = x+11

=> 2x-x= 11-6

=> x= 5

So the age of his sister now is 5 years and the age of Arvind is 5+8 = 13years.

Hope this solves the question :)

Answer:

let sis age be x

than arun's present age =x+8=y

after 3 years,

sis age will be x+3

arun's age will be 2(x+3)=y+3

soving

we get

aruns present age is 13

and sis age is 5