The Doctor told Ros to take a dosage of penicillin of 0.5 g twice a day for seven days. The drug comes in tablets that have a strength of 125 mg per pill. How many pills should the pharmacist give Ros?
Question
The Doctor told Ros to take a dosage of penicillin of 0.5 g twice a day for seven days. The drug comes in tablets that have a strength of 125 mg per pill. How many pills should the pharmacist give Ros?
Solution
Step 1: Convert the dosage from grams to milligrams. We know that 1 gram is equal to 1000 milligrams. So, 0.5 grams is equal to 0.5 * 1000 = 500 milligrams.
Step 2: Calculate how many pills Ros needs to take each time. Each pill contains 125 milligrams, so Ros needs to take 500 / 125 = 4 pills each time.
Step 3: Calculate how many pills Ros needs to take each day. The doctor told her to take the dosage twice a day, so she needs to take 4 * 2 = 8 pills each day.
Step 4: Calculate how many pills Ros needs for seven days. She needs to take 8 * 7 = 56 pills in total.
So, the pharmacist should give Ros 56 pills.
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