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#
Question:

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.