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 my adults are there at the library.
There will be 108 adults. Since the number of children are 45 and the ratio of adults to children is 12:5, divide 45/5. That equals 9. So since you have that down, multiply 12x9. That equals 108.
