A store sells 12 cans of soup for $18. How much would it cost you to buy 7 cans of soup?
2 answers:
12 7
----- = ----------
$18 ?
Using cross products
12 * ? = 18* 7
? =126/12
$10.50
Divide 12 by 18 to know the cost PER can, then multiply it by 7.
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