Devaughn's age is two times sydney's age. the sum of their ages is 15 . what is sydney's age?

Devaughn's age = d

Sydney's age = s

d = 2s

d + s = 15

2s + s = 15

3s = 15

s = 5

Sydney is 5 years old

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.