Question

Russell is 20 years younger than Emma. 3 years ago, Emma's age was 2 times Russell's age. How old is Russell now?

Answer 1

ages now:

Russell = x-20
Emma = x
ages 3 years ago:
Russell = x-23
Emma = x-3
So, now we know that
x-3 = 2(x-23)
and now just finish it up