A family has 2 cars. The 1st car has a fuel efficiency of 20 mpg and the 2nd car has one of 15 mpg of gas.
During one week, the two cars went a combined total of 825 miles for a total gas consumption of 45 gals
How many gallons were consumed by each of the two cars that week?
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Lets assume fuel consumed by 2nd car = x
" " " 1st car = 45-x
Total distance traversed = 825 = 20(45-x) + 15*x
=> 825 = 900 -20x +15x
=> x = 75/5 = 15
Hence 1st car consumed = 45-15 = 30 gals of gas
And 2nd car consumed = 15 gals if gas.
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