An airplane traveling 750 miles uses 60 gallons of gasoline. How many gallons will it need to travel 1500 miles?

• A. 90 gallons
• B. 110 gallons
• C. 130 gallons
• D. 120 gallons

Answer: (D)

Fuel use in this scenario is directly proportional to distance when conditions stay the same. So you can find the fuel per mile and then apply it to the new distance.

First, determine how many gallons are used per mile: 60 gallons for 750 miles means 60/750 = 0.08 gallons per mile. For 1500 miles, multiply 0.08 by 1500, giving 0.08 × 1500 = 120 gallons.

If you look at the other options, they would correspond to shorter distances at the same rate (for example, 90 gallons would cover 90 ÷ 0.08 = 1125 miles, 110 gallons would cover 1375 miles, and 130 gallons would cover 1625 miles), confirming that 120 gallons is the correct amount for 1500 miles.