Question 974247
Prices in dollars per gallon, and volume in gallons.  Uniform Rates, P*V=D for PRICE, VOLUME, DOLLARS.  P is a rate.


_____________________PRICE___________VOL__________Money
First Buy____________3.18____________30___________(3.18)(30)
Next Buy_____________3.75____________10__________(3.75)(10)
Trip back____________3.65____________20__________(3.65)(20)
TOTALS_______________________________60__________205.9


The COST for the trip was 205.9 dollars.  DOLLARS!!  The <b>PRICE</b> in dollars per gallon was {{{205.9/60}}}.
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3.43 dollars per gallon, the average PRICE.