Ray is 15 years older than his little brother. The sum of their age is 85. How old is Ray ?

Let's say Ray's little brother is x years old.

Ray is then x + 15 years old.
The sum of their ages is x + x + 15 = 85.
Combining like terms, we get 2x + 15 = 85.
Subtracting 15 from both sides, we get 2x = 70.
Finally, dividing both sides by 2, we find x = 35.
Therefore, Ray is 35 + 15 = 50 years old. Answer: \boxed{50}.