jema08 wrote:

I know this must be a low level question. But I'm getting the wrong answer. Can someone please help me out? I feel that I should have these questions down cold given that I've been studying for two months and my test day is in two weeks. Thanks in advance for the help!

A certain car averages 25 miles per gallon of gasoline when driven in the city and 40 miles per gallon 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?

A) 28

B) 30

C) 33

D) 36

E) 38

in city ;

25-> 1 gallon

10-> 10/25= 2/5 gallon

in highway;

40-> 1

50-> 5/4 gallon

total gallon= 2/5+ 5/4= 0.4+1.25= 1.65

hence 60/ 1.65 miles/ gallon = 36.36

Hence D

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