SOLUTION
From the question, the patient needs 100 mg but the drug is available in 50 mg tablets.
We can see that 100 is twice of 50, so using 50 mg tablets should be twice that to make it 100 mg
If the number of tablets is given as x, so the requirement will be calculated as
[tex]x\text{ tablets = }\frac{1\text{ tablet }}{50\text{ mg}}\times100\text{ mg/1 tablet }[/tex]
Hence the last option is the correct answer
