If Jill needed to buy 9 bottles of soda for a party in which 12 people attended, how many bottles of soda will she need to buy for a party in which 8 people are attending?
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Detailed Explanation
We can set up a proportion to solve:
\(\frac{\mathrm{9 bottles} }{\mathrm{12 people} } = \frac{\mathrm{x bottles} }{\mathrm{8 people} }\)
Cross-multiply to solve a proportion:
(9)(8)=(12)(x)
72=12x
6=x
\(\frac{\mathrm{9 bottles} }{\mathrm{12 people} } = \frac{\mathrm{x bottles} }{\mathrm{8 people} }\)
Cross-multiply to solve a proportion:
(9)(8)=(12)(x)
72=12x
6=x
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