HESI A2 Math Practice

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.

Correct Answer: A

Rationale: To convert grams to kilograms, we need to divide by 1000 since there are 1000 grams in a kilogram. Thus, 4,000 grams divided by 1000 equals 4 kilograms. Therefore, the correct answer is A. Choice B is incorrect as it is not the result of the correct conversion. Choice C is incorrect as it represents the equivalent of 1000 grams, not 4000 grams. Choice D is incorrect as it is half of the correct conversion result.

Correct Answer: A

Rationale: To find the distance traveled, we use the formula Distance = Speed x Time. In this case, the train's speed is 80 mph and it travels for 3 hours. So, Distance = 80 mph x 3 hours = 240 miles. Therefore, the correct answer is A: 240 miles. Option B (160 miles) is incorrect because it does not account for the full 3 hours of travel. Option C (280 miles) and Option D (320 miles) are incorrect as they are not the result of the correct calculation using the given speed and time values.

Correct Answer: A

Rationale: To convert liters to milliliters, you multiply by 1000 since there are 1000 milliliters in 1 liter. So, 5 liters x 1000 = 5000 milliliters. Therefore, the correct answer is A: 5000 milliliters. B: 50 milliliters - This is incorrect as it is the result of dividing 5 liters by 100 instead of multiplying by 1000. C: 500 milliliters - This is incorrect as it is the result of multiplying 5 liters by 100 instead of 1000. D: 0.5 milliliters - This is incorrect as it is the result of dividing 5 liters by 10 instead of multiplying by 1000.

Correct Answer: A

Rationale: To subtract 2 5\8 - 7\8, first convert both mixed numbers to improper fractions: 2 5\8 = 21\8 and 7\8 = 7\8. Then, subtract the fractions: 21\8 - 7\8 = 14\8 = 1 & 6\8. Finally, simplify the mixed number to 1 & 5\8. Choice A is correct because after subtracting, the result simplifies to 1 & 5\8. Choices B, C, and D are incorrect as they do not represent the correct result of the subtraction calculation.