aaron is 3 times as old as his son. in ten years, aaron will be twice as old as his son. how old is his son?

His son is 10 years old.

Step-by-step explanation:

Now Aaron's son is s years old, and Aaron is 3s years old.

In 10 years, Aaron's son will be s + 10 years old, and Aaron will be 3s + 10 years old.

In 10 years, Aaron's age will be twice the son's age.

3s + 10 = 2 (s + 10)

3s + 10 = 2s + 20

s = 10

His son is 10 years old.