You mix soda water, fruit punch concentrate, and ginger ale in the ratio of 1 : 2 : 5 to make fruit punch. How many pints of each ingredient should you use to make 4 gallons of fruit punch?

So the ratio is 1 to 2 to 5

so basically 1 unit of soda water to 2 units of fruit punch to 5 units of ginger ale

total is 1+2+5=8 units

so 4 gallons=8 units

divide by 8

1/2 gallon=1 unit

soda water=1 unit=1/2 gallon

fruit punch=2 unit=1/2 times 2=1 gallon

ginger ale=5 unit=5 times 1/2=5/2=2 and 1/2 gallon

soda water=1/2 gallon

fruit punch concentrate=1 gallon

ginger ale=5/2 gallon or 2 and 1/2 gallon