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Mathematics 21 Online
OpenStudy (anonymous):

*Will give medal and fan!* A car went 80 miles on 6 gallons of gas. At the same rate of travel, how far would the car go on 15 gallons of gas?

OpenStudy (perl):

you are given the rate: 80 miles / 6 gallons simplified this is equal to 13.33 miles / gal now multiply this rate by 15 gallons , that will cancel the units

OpenStudy (anonymous):

199.95?

OpenStudy (perl):

correct

OpenStudy (perl):

or 200 miles

OpenStudy (perl):

if you want to find the answer exactly you can do (80/6) miles / gal * 15 gal = 200 miles

OpenStudy (perl):

13.33 was an approximation of 80/6 , which introduces rounding error

OpenStudy (anonymous):

Oh, thanks so much!

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