SOLUTION: The ration of boys to girls in history or 4 to 5 , how ,any girls are in the class of there's 12 boys ?

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Question 704406: The ration of boys to girls in history or 4 to 5 , how ,any girls are in the class of there's 12 boys ?
Answer by Stitch(470) About Me  (Show Source):
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You are given two ratios.
4%2F5+=+12%2FX
Cross multiply
4X+=+5%2A12
Simplify
4X+=+60
Divide both sides by 4
highlight%28X+=+15%29
There are 15 girls in the class