Joan made 1 1/2 gallons of punch. She used 2 pints of lemonade and 3 quarts of ginger ale. The rest of the punch was orange juice. How many quarts of orange juice did Joan use?

Answer 1

(Having used the metric system for the last 50 years, I had to recall all that gallon, pints and quart stuff)

change all to pints
3quarts = 6 pints
1 1/2 gallons = 12 pints

let the amount of orange juice she used be x pints
2 + 6 + x = 12
x = 4 pints

she used 4 pints of orange juice or 2 quarts of orange juice.

(how easy this would have been in litres)