Steve is 15 years older than his sister michelle. in 8 years, he will be twice as old as michelle. how old is each of them now

Let, the Age of Michelle = x
Age of Steve = x + 15

After 8 years, (x + 15 + 8) = 2(x + 8)
x + 23 = 2x + 16
2x - x = 23 - 16
x = 7
So, x + 15 = 22

In short, Age of Michelle is 7 & Age of Steve is 22 Years

Hope this helps!