A blood reading is 30 mg of alcohol per 100 ml of blood. What is this in mg per ml?
Answer and explanation
Correct answer: C. 0.3 mg/ml
- Step 1: 100 ml of blood holds the stated mass, so divide the mass by 100 to get the amount in 1 ml. Step 2. 30 / 100 = 0.3 mg/ml. Answer: 0.3 mg/ml. Why not the others: 3 mg/ml: 3 mg/ml divides by 10 instead of 100. 0.03 mg/ml: 0.03 mg/ml divides by 1000. 30 mg/ml: 30 mg/ml multiplies instead of dividing.
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