eric is twice as old as Shawn. The sum of their ages is 33. How old is Shawn?

eric is twice as old as Shawn. The sum of their ages is 33. How old is Shawn?

Let Eric's age be e. Let Shawn's age be s. We're given two equations:

1. e = 2s
2. e + s = 33

Substitute equation (1) into equation (2) for e so we can solve for s:
2s + s = 33

To solve for s, we type this equation into our search engine and we get:
s = 11