Chicago Virtual Charter School
posted by Eunice .
A movie theater charges $7 for adults, $5 for schoolage children, and $3 for babies. A group of people went to the theater. There were the same number of schoolage children as babies and the number of adults was the same as schoolage children and babies combined. If the group paid $1562, how many babies were in the group ?

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same number of schoolage children as babies
x=number of schoolage children
x=number of babies
number of adults was the same as schoolage children and babies combined
y=number of adults
y=x+x
y=2x
$7(2x) + $5(x)+ $3(x) = $1562
similar problem  look at example 1:
http://www.algebraclass.com/algebrawordproblems.html