Question

what should be added to x-y to get 2x?

Answer 1

Answer:

we have to add x+y ... to get answer 2x

Answer 2

Given:

one number = x-y

sum = 2x

another number= take it as a

Solve:

x-y+a= 2x

-y+a=2x-x

-y+a=x

a=x+y

x+ y should be added