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Answer: 60 girls
If the ratio of girls to boys is 5 to 6, it can be written as 5/6. You can use cross multiplication to figure out how many girls there are if there are 72 boys by setting the number of girls equal to x and dividing it by 72 like so:
After multiplying 5 and 72, and 6 and x, you get the equation
. To find the number of girls, all you have to do is divide by 6, which leaves you with 
, meaning there are 60 girls when there are 72 boys based on the ratio 5:6 (girls to boys).
If the ratio of girls to boys is 5 to 6, it can be written as 5/6. You can use cross multiplication to figure out how many girls there are if there are 72 boys by setting the number of girls equal to x and dividing it by 72 like so:
After multiplying 5 and 72, and 6 and x, you get the equation