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Posted by **Mikayla** on Tuesday, February 7, 2012 at 8:35am.

- algebra -
**Jai**, Tuesday, February 7, 2012 at 9:46amlet x = gallons needed

120 : 7 = 180 : x , or

120/7 = 180/x

x/7 = 180/120

x = 7*3/2

x = 10.5 gallons

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