Question

78 children attended a trip to Six Flags. 60 of them were boys. Find the ratio of the number of boys to girls, and express the number of boys to the number of girls--remember to express the ratio in lowest terms. (3 points)

Answer 1

First we need to find out how many girls there were
Subtract the number of boys from the total
78 - 60 = 18 girls
Boys : Girls
  60   :   18
The GCF of all these numbers is 6, therefore we divide both sides by 6 to get the simplified ratio
60/6 = 10
18/6 = 3
10:3