Question

The ratio of the number of adults to the number of children in a library is 12:5. If there are 45 children in the library, how many adults are there at the library?

Answer 1

The answer is 108.

Explanation:

This can be solved with a simple proportion. 5/12 = 45/1. For 5 to become 45, you need to multiply by 9. You do the same to the denominator. 12 times 9 is 108.

Answer 2

The answer would be 108. 108:45 can be simplified to 12:5.