A patrol car's fuel tank holds 20 gallons. If it currently has 3/4 tank, and it is filled to full, how many gallons are added?

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Study for the NYPD Auxiliary Police Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ace your exam!

Multiple Choice

A patrol car's fuel tank holds 20 gallons. If it currently has 3/4 tank, and it is filled to full, how many gallons are added?

Explanation:
Converting a fraction of a whole into an actual quantity is what this problem tests. The tank holds 20 gallons, and it’s currently three quarters full, so you have 3/4 of 20, which equals 15 gallons. To reach full capacity, you need to add 20 − 15 = 5 gallons. So five gallons should be added. The other options don’t fit: adding two would leave 17 gallons (not full), and adding eight or ten would push the total above the tank’s 20-gallon capacity.

Converting a fraction of a whole into an actual quantity is what this problem tests. The tank holds 20 gallons, and it’s currently three quarters full, so you have 3/4 of 20, which equals 15 gallons. To reach full capacity, you need to add 20 − 15 = 5 gallons. So five gallons should be added. The other options don’t fit: adding two would leave 17 gallons (not full), and adding eight or ten would push the total above the tank’s 20-gallon capacity.

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