Step-by-step explanation: To find out how much active ingredient is in 10 gallons of bleach that is 5% active ingredient, we need to use the following formula: Active ingredient = Volume of bleach × Percentage of active ingredient first, we need to convert the percentage to a decimal by dividing by 100.5% = 5/100 = 0.05Now we can substitute the values into the formula: Active ingredient = 10 gallons × 0.05= 0.5 gallonsTherefore, there are 0.5 gallons of the active ingredient in 10 gallons of bleach that is 5% active ingredient.