Posted by **lisa** on Thursday, February 14, 2013 at 6:47pm.

if the ratio of boys to girls is 3/4 and there are 49 students how many boys are there?

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**Ms. Sue**, Thursday, February 14, 2013 at 6:56pm
3/7 = x/49

Cross multiply and solve for x.

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**lisa**, Thursday, February 14, 2013 at 7:28pm
75

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**Ms. Sue**, Thursday, February 14, 2013 at 7:34pm
Does 75 make sense? There are only a total of 49 students.

This site explains how to solve a problem with a proportion.

http://www.aaamath.com/rat-prop-crossx.htm

- math -
**x**, Thursday, April 2, 2015 at 10:09am
21

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