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

Let's assume Ray's age to be x years.

Therefore, his little brother's age would be x - 15 years.
The sum of their ages is 85 years, so the equation we can form is:
x + (x - 15) = 85.
By simplifying the equation, we get:
2x - 15 = 85.
Adding 15 to both sides, we have:
2x = 100.
Dividing both sides by 2, we get:
x = 50.
Hence, Ray is 50 years old.