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A family has two cars. The first car has a fuel efficiency of 30 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. During one particular week, the two cars went a combined total of 1050 miles, for a total gas consumption of 50 gallons. How many gallons were consumed by each of the two cars that week?

 Jul 8, 2020
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x gal = 30 mpg #

50-x  = 15 mpg #

 

30 x         +      15 (50-x)      = 1050         solve for 'x'  the number of gallons at 30mpg. then the # 15 mpg gallons is 50 -x

 Jul 8, 2020

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