Given:
A tablet contains 70mg of drug X.
Required:
To find how many mg of drug X does one and a half tablets contain.
Step-by-step explanation:
Given that a tablet contains 70mg of drug X.
Then the quantity of drug X (in mg) that one and a half tablets contains is given by,

Hence, one and a half tablets contains 105 mg of drug X.
Final Answer:
One and a half tablets contains 105 mg of drug X.
Option c is correct.