Performing Operations in Public Health Contexts — Quiz
Question 5 • College Readiness Mathematics
The chronic daily intake of nitrates for 12 -year-old children who have an average body weight of 45 kg and drink 1 L of water per day can be found using the equation CDI=((IR)C)/(ABW) , where IR is the intake rate in liters of water per day, C is the concentration of nitrate in milligrams per liters, and ABW is the average body weight. The rate is recalculated 18 months later for the same group of children, who are now drinking (1)/(4) L more per day and have a new average body weight of (1)/(2) kg more. In each test, there were 22.5 mg of nitrate in 2.5 L of water. Which expression represents the recalculation?
Answer
A
CDI=22.52.5(1 + 12)45
B
CDI=(1 + 14)22.52.545 + 12
C
cap c cap d cap i is equal to the fraction with numerator 22 point 5 over 2 point 5 and denominator 45
D
CDI=22.52.5 + 1245+ 14
Explanation
Use the updated values in CDI = (IR × C) / ABW. The new intake rate is 1 + 1/4 L per day, the nitrate concentration is 22.5 ÷ 2.5 mg/L, and the new average body weight is 45 + 1/2 kg. Choice B places these values in the correct parts of the equation.
AI-written and checked against the verified answer.