A tank holds 60 gallons. If it is 75% full, how many gallons does it contain?

To find out how many gallons the tank contains when it is 75% full, you need to calculate 75% of the total capacity of the tank, which is 60 gallons.

First, convert the percentage to a decimal for calculation by dividing 75 by 100, giving you 0.75. Then, you multiply this decimal by the total capacity of the tank:

0.75 × 60 gallons = 45 gallons.

Thus, when the tank is 75% full, it contains 45 gallons. This calculation confirms that the answer of 45 is correct, as it reflects an accurate application of percentage calculation to find a specific portion of the tank's total volume.