Question

in 1o year,A will be twice as B was 10 year ago.IfA is now 9 year older than B the present age of B is-

Answer 1

let the age of A be x and age of B be y
the equation form is....
2(x+10)=y-x
=>2x+20=y-10
=>2x-y=10
according to the question
x=9
so, by putting the value we get,
2(9)-y=10
=>-y=10-18
=>y=8
hence age of B is 8 yrs