SOLUTION: If your car get 28 miles per gallon city an 39 miles highway. You are traveling 1543 miles. An cost per fuel is average $3.00 gallon what would the trip cost?

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Question 1130048: If your car get 28 miles per gallon city an 39 miles highway. You are traveling 1543 miles. An cost per fuel is average $3.00 gallon what would the trip cost?
Found 2 solutions by greenestamps, josgarithmetic:
Answer by greenestamps(13198) About Me  (Show Source):
You can put this solution on YOUR website!


The problem as posted can't be solved; we need to know how many of the miles were highway and how many were city.

Answer by josgarithmetic(39615) About Me  (Show Source):
You can put this solution on YOUR website!
Average fuel price of  $3.00 per gallon


          Fuel Effic MPG       Dollars per Mile    Distance MILES    COST dollars

City        28                 3/28                  x               (3/28)x

Highway     39                 3/39                  y               (3/39)y

Total                                               1543

The cost of the trip depends on two variables for distances x and y.
Total cost: %283%2F28%29x%2B%283%2F39%29y

You could take this another step and use x%2By=1543
y=1543-x

substituting that,
%283%2F28%29x%2B%283%2F39%29%281543-x%29----and simplify this if you want, and have the cost in terms of the city miles distance, keeping the constant total trip 1543 miles.