Question

: Jada drinks a cup of tea every morning at 8:00 a.m. for 14 days. There is 40 mg of caffeine in each cup of tea she drinks. 24 hours after she drinks the tea, only 6% of the caffeine is still in her body. How much caffeine is in her body right after drinking the tea on the first, second, and third day? a. First day: 40 mg, Second day: 40 mg, Third day: 40 mg b. First day: 40 mg, Second day: 3.6 mg, Third day: 0.324 mg c. First day: 40 mg, Second day: 2.4 mg, Third day: 0.216 mg d. First day: 40 mg, Second day: 2.4 mg, Third day: 0.024 mg

Answer 1

Step-by-step explanation:

First day:

Right after drinking the tea, all the caffeine she drank is in her body. She drank 40 mg, so 40 mg is in her body right after drinking the tea on the first day.

Second day:

24 hours later, she drinks another 40 mg of caffeine and still has 6% of the caffeine in her body from the first day. To find how much caffeine she had in her body, find 6% of 40 mg:

40 mg * 0.06

2.4 mg

So, Jada had 2.4 mg of caffeine still in her body from the first day. Then she drank another 40 mg, making a total of 42.4 mg of caffeine in her body right after drinking her tea on the second day.

Third day:

24 hours later, she drinks another 40 mg of caffeine, and still has 6% of the caffeine in her body from the second day. Amount of caffeine still in her body:

42.4 mg * 0.06

2.544 mg

There is 2.544 mg of caffeine in her body on the third day, then she drinks 40 mg more caffeine. So she had 42.544 mg of caffeine in her body right after drinking her tea on the third day.