A syrup contains 40 mg of a drug in 5 ml. How many ml contain a dose of 120 mg?
Answer and explanation
Correct answer: C. 15 ml
- Step 1: 40 mg are in 5 ml, so 1 mg is in 5/40 ml. Step 2. 120 x 5/40 = 15 ml. Answer: 15 ml. Why not the others: 960 ml: the quantities were multiplied instead of using a ratio. 3 ml: the volume factor of the syrup was left out. 30 ml: the volume was doubled.
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