At the start of 1980, the average lead content in blood had dropped to about 10 μg/dL blood. How many mg is that in 2.0 gallons of blood? (1 gallon = 3.7854 L)
A) 750 mg
B) 0.80 mg
C) 0.75 mg
D) 0.20 mg
E) 80 mg

Question

Quizplus · Accepted Answer

First, convert 2.0 gallons to liters: 2.0 gallons * 3.7854 L/gallon = 7.5708 L. Since 10 μg/dL is equivalent to 0.1 mg/L, the total lead content in 7.5708 L is 7.5708 L * 0.1 mg/L = 0.75708 mg, which rounds to 0.75 mg.

At the Start of 1980, the Average Lead Content in Blood