Apharmacy technician must prepare 120 ounces (oz) of infant formula for the neonatal intensive care unit. the mixture is 1/4 formula and 3/4 water . how much formula should she use? how much water?

Let:

x    be the amount formula (oz)

3x  be the amount of water (oz)

x  + 3x = 120

      4x = 120

        x = 30

Then:

x   = 30

3x = 90

A 120 oz of ready to consume infant feed should be composed of 30 oz of formula and 90 oz water.