The ratio of the number of boys to the number of girls in a choir is 6 to 5. There are 45 girls in the choir. How many boys are in the choir?
If the ratio of boys to girls is 6 to 5, we can set up the proportion:
number of boys / number of girls = 6/5
We know the number of girls is 45, so we can substitute:
number of boys / 45 = 6/5
To solve for the number of boys, we can cross-multiply:
number of boys * 5 = 45 * 6
number of boys = 270/5
number of boys = 54
Therefore, there are 54 boys in the choir.