Question

24 ounces of instant tea at 30 milligrams of caffeine per 8 ounces and 12 ounces of green tea at 15 milligrams of caffeine per 8 ounces. Write an equation to find how many milligrams in the mixture?

Answer 1

3.125 mg/ oz

Explanation:

Amount of instant tea = 24 ounces

Amount of green tea = 12 ounces

Caffeine in instant tea = 24/8*30= 90 mg/oz

Also, caffeine in green tea = 12/8*15 =22.5 mg/oz.

Total amount of mixture= 24+12= 36 ounce

Total amount of caffeine in the mixture = 90+22.5 = 112.5 mg/oz

Caffeine per ounce in the final mixture = 112.5 / 36 = 3.125 mg/ oz