There are 144 people in an audience. The ratio of adults to children is 5 to 3. How many are adults?

There are 144 people in an audience. The ratio of adults to children is 5 to 3. How many are adults?

We set up an equation to represent this:
5x + 3x = 144

Typing this equation into our search engine, we get:
x = 18

This means we have:
Adults = 5(18)
Adults = 90

Children = 3(18)
Children = 54