Lin made a mixture consisting of 24 ounces of instant tea and 12 ounces of green tea. approximately how many milligrams of caffeine per ounce were in this final mixture?

Amount of instant tea = 24 ounces

Amount of green tea = 12 ounces

Caffeine in instant tea = 40 mg / 8 fl. oz. = 5 mg/fl.oz.

Caffeine in green tea = 25 mg /8 fl. oz. = 3.125 mg/fl.oz.

Caffeine in 24 ounces of instant tea = 5* 24 = 120 mg

Caffeine in 12 ounces of green tea = 3.125 * 12 = 37.5 mg

Total amount of the mixture = 24 + 12 =36 ounces

Total amount of caffeine in the mixture = 120 + 37.5 = 157.5 mg

Caffeine per ounce in the final mixture = 157.5 / 36 = 4.375 mg/ fl.oz

3.13

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