HESI A2 Math Practice Exam

Correct Answer: C

Rationale: To calculate the flow rate in drops per minute, we first convert the infusion time to minutes (4 hours = 240 minutes). Then, we multiply the total volume (500 ml) by the number of drops per milliliter (20) to get the total drops. Dividing total drops by total time gives the flow rate. Therefore, 500 ml x 20 drops/ml = 10,000 drops. Flow rate = 10,000 drops / 240 minutes = 41.67 drops/min. Rounding up, the correct answer is C: 50 drops/min. Choice A is incorrect as it is half the correct value. Choices B and D are incorrect as they are double and quadruple the correct value, respectively.

Correct Answer: A

Rationale: To find the number of black marbles, we need to subtract the number of white marbles from the total. 34% of 6,657 is white marbles, which is approximately 2,261. So, the number of black marbles is 6,657 - 2,261 = 4,396. The closest option is A: 4,394, which is the correct answer. Choices B, C, and D are incorrect because they do not accurately represent the calculated number of black marbles.

Correct Answer: A

Rationale: To find the weight of a 7 lb. baby in grams, multiply 7 (lbs) by the conversion factor 453.59 (grams/lb). 7 lbs x 453.59 = 3175.13 grams. Therefore, the correct answer is A. Choice B (4000 grams) is incorrect as it does not consider the precise conversion factor. Choice C (4535 grams) is incorrect as it simply multiplies 7 by 1000. Choice D (3500 grams) is incorrect as it uses a different conversion factor.

Correct Answer: D

Rationale: To find the total number of patients seen in 8 hours, first calculate the number of patients seen in 1 hour (25/4 = 6.25). Then, multiply by 8 to get the total (6.25 * 8 = 50). Therefore, the correct answer is D. Choices A, B, and C are incorrect because they do not follow the correct calculation process. A, B, and C do not consider the rate of patients seen per hour or the total hours the clinic is open.

Correct Answer: A

Rationale: To find the number that 44 is 25% of, we divide 44 by 0.25 (which is 25% expressed as a decimal). 44 / 0.25 = 176. Therefore, 44 is equal to 25% of 176. Option A (176) is the correct answer. Option B (150), C (180), and D (120) are incorrect as they do not result in 44 when multiplied by 0.25.