Question

Devaughn's age is two times Sydney's age. The sum of their ages is
15
. What is Sydney's age?

Answer 1

5? Because 5x2 is 10 and 10+5 is 15.

Answer 2

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