Question

The directions for a pain reliever recommend that an adult of 60 kg and over, takes 4 tablets every 4 hours as needed, and an adult who weighs between 40 kg and 50 kg takes only $2\frac{1}{2}$ tablets every 4 hours as needed. Each tablet weighs $\frac{4}{25}$ gram

(a) If a 72 kg adult takes 4 tablets, how many grams of pain reliever is he or she receiving ?

(b) How many grams of pain reliever is recommended dose for an adult weighing 46 kg ?

Answer 1

(a) Given, 72 kg adult takes 4 tablets and each tablet weighs $\frac{4}{25}g$.
$\therefore$ Total weight of pain reliever, he/she is receiving
$=4\times \frac{4}{25}g=\frac{16}{25}g$

(b) Given weight of pain reliever he/she is receiving
$=(\frac{4}{25}\times 2\frac{1}{2})g=[\frac{4}{25}\times \frac{(2\times 2)+1}{2}]g=(\frac{4}{25}\times \frac{5}{2})g=\frac{2}{5}g$