Posted by **student** on Monday, December 7, 2009 at 8:28pm.

The ratio of boys to girls in Mr. Joiner’s class is 5 to 7. If there are 15 boys in the class, how many total students are in the class?

- math -
**Ms. Sue**, Monday, December 7, 2009 at 8:30pm
Let x = the number of girls.

Cross multiply and solve for x.

5/7 = 15/x

Add the number of boys and girls together.

- math -
**Paula**, Monday, December 7, 2009 at 8:31pm
15 boys is three times the number of boys originally, so there are 21 girls, meaning there is a total of 36 students.

- math -
**bill**, Thursday, January 29, 2015 at 4:55pm
5+7=12

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