Ashley age is 2 times Johns age. The sum of their ages is 63. What is Johns age?

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Ashley age is 2 times Johns age. The sum of their ages is 63. What is Johns age?

Let Ashley's age be a.
Let John's age be j.

We have two equations:

1. a = 2j
2. a + j = 63

Now substitute (1) into (2)
(2j) + j = 63

Combine like terms:
3j = 63

Typing 3j = 63 into our search engine, we get
j = 21