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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?

A 6
Explaination
We can set up a proportion to solve:
$4553_w156_h42.png$
Cross-multiply to solve a proportion:
(9)(8)=(12)(x)
72=12x
6=x.
B 8
C 10
D 12