Free NEX Mathematics Questions and Answers 1 — Questions and Answers
Question 1: A medication is supplied as 120 mg in 4 mL. A patient requires a dose of 150 mg. How many mL should the nurse administer?
- 4.5 mL
- 5 mL (Correct answer)
- 5.5 mL
- 6 mL
Correct answer: 5 mL
This is a ratio and proportion problem. Set up the equation (120 mg / 4 mL) = (150 mg / x mL). Cross-multiply to get 120x = 150 * 4, which simplifies to 120x = 600. Solve for x by dividing 600 by 120, which equals 5 mL.
Question 2: A patient's fluid intake was 1,200 mL, and their fluid output was 900 mL. What is the ratio of intake to output in its simplest form?
- 3:4
- 12:9
- 4:3 (Correct answer)
- 1.33:1
Correct answer: 4:3
The initial ratio is 1200:900. To simplify a ratio, find the greatest common divisor (GCD) for both numbers. Both 1200 and 900 can be divided by 300. 1200 / 300 = 4, and 900 / 300 = 3. Therefore, the simplest form of the ratio is 4:3.
Question 3: A patient's weight decreased from 200 pounds to 175 pounds after a new diet and exercise plan. What was the percentage decrease in the patient's weight?
- 10%
- 12.5% (Correct answer)
- 15%
- 25%
Correct answer: 12.5%
First, find the amount of weight lost: 200 - 175 = 25 pounds. To find the percentage decrease, use the formula: (Amount of Decrease / Original Amount) * 100. So, (25 / 200) * 100 = 0.125 * 100 = 12.5%.
Question 4: A nursing unit has 80 staff members. If 15% of the staff are on vacation, how many staff members are working?
- 12
- 65
- 70
- 68 (Correct answer)
Correct answer: 68
First, calculate the number of staff on vacation: 80 * 0.15 = 12. Then, subtract the number of staff on vacation from the total staff to find who is working: 80 - 12 = 68. Alternatively, if 15% are on vacation, 85% are working. 80 * 0.85 = 68.
Question 5: A solution of disinfectant requires 2 parts concentrate to 7 parts water. If you need to make a total of 450 mL of solution, how much concentrate do you need?
- 50 mL
- 100 mL (Correct answer)
- 150 mL
- 350 mL
Correct answer: 100 mL
The total number of 'parts' in the solution is 2 + 7 = 9 parts. The proportion of concentrate is 2 out of 9 parts. To find the amount of concentrate needed for 450 mL, calculate (2/9) * 450. (450 / 9) = 50, and 50 * 2 = 100 mL.
Question 6: A patient is prescribed 2 liters of IV fluid to be administered over 24 hours. After 8 hours, 800 mL has been infused. What percentage of the total fluid has been administered?
- 20%
- 33.3%
- 40% (Correct answer)
- 50%
Correct answer: 40%
First, ensure the units are consistent. The total fluid is 2 liters, which is 2000 mL. To find the percentage, use the formula (Part / Whole) * 100. So, (800 mL / 2000 mL) * 100 = 0.4 * 100 = 40%.
Free NEX Mathematics Questions and Answers 1
A medication is supplied as 120 mg in 4 mL.
A patient requires a dose of 150 mg.
How many mL should the nurse administer?