Posted by **natalie** on Thursday, November 12, 2009 at 1:50pm.

a 68 mile trip uses 2 gallons of gas. how many gallons would you use on a 110 mile trip? round to the nearest tenth of a gallon.

- 10th grade algebra not ms.sue -
**zorro**, Thursday, November 12, 2009 at 2:02pm
I would just set it up as a proportion and cross multiply. 68/2=110/? or 2/68=?/110

- 10th grade algebra not ms.sue -
**natalie**, Thursday, November 12, 2009 at 2:07pm
what is the ? for

- 10th grade algebra not ms.sue -
**DrBob222**, Thursday, November 12, 2009 at 2:22pm
The ? is the answer. You solve for that.

- 10th grade algebra not ms.sue -
**natalie**, Thursday, November 12, 2009 at 2:32pm
how like what do i do

- 10th grade algebra not ms.sue -
**Haley**, Saturday, November 14, 2009 at 6:33pm
68 = 110

---- ----

2 x

This is how to set up the proportion that zorro was talking about, although he did it incorrectly.

Cross multiply:

110 (2) = 220

68 (x) = 68x

Therefore:

220 = 68x

Solve for x by dividing by 68 on both sides.

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