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A science teacher has decided to attend a conference in Chicago. She lives in Indianapolis, 180 miles away. She has been considering buying a new car. Her older SUV gets about 20 miles per gallon. The new hybrid she’s considering gets about 30 mpg.

If she buys the new car and takes it to the conference, how many gallons of gasoline will she be saving?

Consider only the one-way trip from home to the conference.

A

3

B

6

C

9

D

20

E

30

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