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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