To batch mix 3% foam into a 500-gallon (1894 L) booster tank, you would need to add _____ of foam concentrate to the tank.

To determine the correct amount of foam concentrate needed to achieve a 3% foam solution in a 500-gallon booster tank, it's important to understand how concentrations are calculated.

A 3% foam solution means that for every 100 gallons of total solution, 3 gallons must be foam concentrate. Therefore, to find out how much foam concentrate is required for 500 gallons, you can use the following calculation:

1. Calculate the total amount of foam concentrate needed for 500 gallons:

• 3% of 500 gallons equals 0.03 x 500 = 15 gallons.

This calculation shows that to achieve a 3% solution in a 500-gallon tank, you would need to add 15 gallons of foam concentrate. This method ensures that the solution remains effective for fire suppression as the proper ratio is maintained.

The other options fall short because they do not provide the correct ratio necessary to produce a 3% solution in 500 gallons. Each of those numbers represents either a significantly lower concentration or miscalculates the total volume required, failing to meet the needs for effective fire suppression using foam.