A vehicle's fuel efficiency is 28 miles per gallon. If the officer drives 210 miles, how many gallons are used?

A vehicle's fuel efficiency is 28 miles per gallon. If the officer drives 210 miles, how many gallons are used?

• A. 7.0 gallons
• B. 8.5 gallons
• C. 7.5 gallons
• D. 6.5 gallons

Answer: (C)

Fuel efficiency tells you how far you can travel per gallon, so the amount of fuel used is the distance divided by miles per gallon. Compute 210 miles ÷ 28 miles per gallon = 7.5 gallons. You can verify by multiplying back: 28 mpg × 7.5 gallons = 210 miles, which matches the distance driven. The other amounts would cover different distances (for example, 7.0 gallons would only cover 196 miles, 8.5 gallons would cover 238 miles, and 6.5 gallons would cover 182 miles), so 7.5 gallons is the exact amount used.

Fuel efficiency tells you how far you can travel per gallon, so the amount of fuel used is the distance divided by miles per gallon. Compute 210 miles ÷ 28 miles per gallon = 7.5 gallons. You can verify by multiplying back: 28 mpg × 7.5 gallons = 210 miles, which matches the distance driven. The other amounts would cover different distances (for example, 7.0 gallons would only cover 196 miles, 8.5 gallons would cover 238 miles, and 6.5 gallons would cover 182 miles), so 7.5 gallons is the exact amount used.