Sara is mixing together a fruit punch for a party. She's made 4 gallons of punch with a mixture of 50% juice. Her mother tells her to change it to a mixture of 60% juice. How much fruit juice should be added to make the mixture 60% fruit juice (round to the nearest hundredth)?
2.4 gallons according to my calculations.
She should add .4 of a gallon of juice to make it 60% juice