A car averages 25 miles per gallon of gasoline when driven on the highway. According to these rates, which of the following is closest to the number of miles per gallon that the car averages when it is driven 10 miles in the city and then 50 miles on the highway?
Solution
Correct Answer: Option B
Car averages x miles per gallon, means that 1 gallon is enough to drive x miles. We are asked to find average miles per gallon (miles/gallon) --> average miles per gallon would be total miles driven divided by total gallons used (miles/gallon). Total miles driven is 10+50=60. As car averages 25 miles per gallon in the city for 10 miles in the city it will use 10/25=0.4 gallons; As car averages 40 miles per gallon on the highway for 50 miles on the highway it will use 50/40=1.25 gallons; So average miles per gallon equals to
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