Question

in 10 year a will be twice as old as b was 10 year if a is 9 year old tha b the present​

Answer 1

Let the present age of B be x and the A be x+9

According to question

2x = x+9+10

2x-x = 19

x = 19

thus the present age of B = x = 19yrs

A = x+9=19+9 = 28yrs

Answer 2

let the present age of a= a

and. b= b

a+10=2( b+10)

a -2b=10---------------(1)

a=b+9-------------------(2)

solve further by elimination or any method dude hope helps.