Answer:
Cups of white paint = 24 * 1/4 = 6 cups
Cups of red paint = 24 * 1/4 = 6 cups
Cups of blue paint = 24 * 1/2 = 12 cups
Explanation:
1/4 cup of white paint is added for every :
1/4 cup of red paint and 1/2 cup of blue paint :
1 gallon = 16 cups
1 1/2 gallons = 16 + 8 = 24 cups
To make 1 cup of lighter purple paint ;
1/4 cup of white + 1/4 cup of red + 1/2 cup of blue
Therefore ;
To make 24 cups of lighter purple paint :
Cups of white paint = 24 * 1/4 = 6 cups
Cups of red paint = 24 * 1/4 = 6 cups
Cups of blue paint = 24 * 1/2 = 12 cups