Final answer:
To find out how many tablets are needed per day for a dosage of 0.225 mg of Synthroid, divide the dosage in µg by the Synthroid content of the tablets, which is 75 µg.
Step-by-step explanation:
To find out how many tablets are needed per day for a dosage of 0.225 mg of Synthroid, we need to convert the dosage to the same unit as the tablets, which is µg. First, we convert mg to µg by multiplying by 1000, so 0.225 mg = 225 µg. Next, we divide the dosage in µg by the Synthroid content of the tablets, which is 75 µg. So, 225 µg ÷ 75 µg = 3 tablets. Therefore, 3 tablets are needed per day for a dosage of 0.225 mg of Synthroid.