HESI A2 Math Practice

Correct Answer: A

Rationale: To convert quarts to ounces, we know that 1 quart equals 32 ounces. To find the number of ounces in 3 5/8 quarts, we multiply 3 by 32 (96 oz) and add 5/8 of 32 (16 oz). Therefore, 3 5/8 quarts equals 96 + 16 = 112 ounces. The correct answer is 184 oz, which is obtained by multiplying 3 5/8 quarts by 32 (quarts to ounces conversion factor). Other choices are incorrect because they do not correctly apply the conversion factor from quarts to ounces or use incorrect calculations.

Correct Answer: B

Rationale: To find out how many ounces are in 2.5 gallons, we multiply 128 (ounces in 1 gallon) by 2.5. 128 x 2.5 = 320 ounces. Therefore, the correct answer is B (320 ounces). Choice A (256 ounces) is incorrect as it doesn't account for the extra 0.5 gallons. Choice C (400 ounces) is incorrect as it overestimates the total ounces. Choice D (250 ounces) is incorrect as it miscalculates the total ounces by not considering the full 2.5 gallons.

Correct Answer: A

Rationale: The correct answer is A: 1/6. There is only one face on a six-sided die that shows a 3, so the probability of rolling a 3 is 1 out of 6 possible outcomes (1, 2, 3, 4, 5, 6). To calculate the probability, divide the favorable outcomes (1) by the total possible outcomes (6), which gives 1/6. Summary: B: 1/4 - Incorrect, as there is only one 3 on a six-sided die, not 1 out of 4. C: 1/3 - Incorrect, as the probability of rolling a 3 is 1 out of 6, not 1 out of 3. D: 1/2 - Incorrect, as only one face represents a 3, not half of the faces on a six-sided die.

Correct Answer: B

Rationale: The correct answer is B: 3 units. To determine the insulin dose, we first calculate the excess blood sugar above 100mg/dL, which is 80mg/dL (180-100). Then, we use the ratio of 1 unit per 40mg/dL excess, resulting in 2 units for the first 80mg/dL. Since the blood sugar is 180mg/dL, an additional unit is needed for the remaining 40mg/dL above 100mg/dL, totaling 3 units. Choice A: 2 units - This is incorrect as it only accounts for the first 80mg/dL excess and does not consider the additional 40mg/dL above 100mg/dL. Choice C: 4 units - This is incorrect as it overestimates the insulin dose by not using the correct ratio of 1 unit per 40mg/dL excess. Choice D: 5 units - This is incorrect as it

Correct Answer: B

Rationale: To determine the number of nurses needed for 25 patients, we can set up a proportion based on the given information. If 3 nurses can care for 15 patients, then the ratio of nurses to patients is 3:15 or 1:5. To find out how many nurses are needed for 25 patients, we can set up the proportion 1/5 = x/25 and solve for x. Cross multiplying gives us 5x = 25, so x = 25/5 = 5. Therefore, 5 nurses are needed for 25 patients. Choice A (4 nurses) is incorrect because it does not account for the increased number of patients. Choice C (6 nurses) and Choice D (7 nurses) are also incorrect as they overestimate the number of nurses needed based on the given ratio of nurses to patients.