A syrup contains 25 mg of a drug in 5 ml. How many ml contain a dose of 75 mg?
Answer and explanation
Correct answer: B. 15 ml
- Step 1: 25 mg are in 5 ml, so 1 mg is in 5/25 ml. Step 2. 75 x 5/25 = 15 ml. Answer: 15 ml. Why not the others: 375 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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