SOLUTION: In a family there are two cars. The sum of the average miles per gallon obtained by the two cars in a particular week is 45. The first car has consumed 40 gallons during that week,
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Question 196171: In a family there are two cars. The sum of the average miles per gallon obtained by the two cars in a particular week is 45. The first car has consumed 40 gallons during that week, and the second car has consumed 20 gallons, for a total of 1400 miles driven by the two cars combined. What was the average gas mileage obtained by each of the two cars that week?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the average mpg for the 1st car
Let = the average mpg for the 2nd car
given:
(1) mi/gal
(2) mi
Multiply both sides of (1) by 20
and subtract (1) from (2)
mi/gal
and
(1)
mi/gal
The 1st car got 25 mpg and the 2nd car got 20 mpg
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