PSAT Math Multiple-Choice Question 364: Answer and Explanation

Question: 364

Jack is taking a road trip. If he travels 180 miles while his car uses gasoline at a rate of 40 miles per gallon and then travels another 105 miles while his car uses gasoline at a rate of 35 miles per gallon, how many gallons of fuel has his car consumed?

• A. 1.5
• B. 3.0
• C. 4.5
• D. 7.5

Correct Answer: D

Explanation:

D

Difficulty: Easy

Getting to the Answer: To determine the equations to find the gallons of fuel used during each leg of Jack's trip, set up the units to cancel out. Plugging in values for the first leg, you get:

For the second leg:

Added together, there are 4.5 + 3 = 7.5 gallons of fuel used, which matches (D).