Bryant just drank a cup of coffee to help him stay awake. The coffee had 52 milligrams of caffeine in it. If his body processes
20% of the caffeine every hour, how much will be left in 9 hours?
1 answer:
Let c be caffeine, h be hours, mg milligrams:
c= 52 mg
1h =.2 (52)= 10.4
x/9h=10.4/1h
x= 93.6 mg
93.6- 52= 41.6 mg of caffeine will be left behind.
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