A car traveled 462 miles per tankful of gasoline on the highway and 336 miles per tankful of gasoline in the city. If the car traveled 18 fewer miles per gallon in the city than on the highway, how many miles per gallon did the car travel in the city?
Answers
A) 14 B) 16 C) 21 D) 32 E) 48
I treat such problems as work ones.   Work=Rate*Time   Mileage(m)=Rate(mpg)*Gallons(g)   X gallons is a full tank   {462=RX   {336=(R-18)X solve for R, R=66   66-18= 
<gadget id="calculator">66-18</gadget>
<output>48</output>
48 mpg   48
<result>E</result>
A car traveled 462 miles per tankful of gasoline on the highway and 336 miles per tankful of gasoline in the city. If the car traveled 18 fewer miles per gallon in the city than on the highway, how many miles per gallon did the car travel in the city?