HESI A2 Math

Correct Answer: B

Rationale: The correct answer is B (6:00 PM). Taking the medication 12 hours apart from the first dose at 8:00 AM ensures it's evenly spaced throughout the day. 6:00 PM is the most convenient time as it allows for the second dose without disrupting sleep, as it falls after dinner but before bedtime. Choice A (4:00 PM) is too early, which may lead to missing the second dose during the evening. Choices C (8:00 PM) and D (10:00 PM) are too late and might interfere with sleep if taken too close to bedtime. Thus, B is the best option for maintaining the medication schedule effectively.

Correct Answer: C

Rationale: The correct answer is C (27 hours). The truck driver left at 10:00 AM on Tuesday and arrived at 6:00 PM on Wednesday, which is a total of 32 hours. To calculate the driving time, we subtract the time spent overnight (10 hours) from the total time, giving us 22 hours. However, we need to add the 5 hours the driver drove on Tuesday from 10:00 AM to 6:00 PM, totaling 27 hours. Choice A (28 hours) is incorrect because it does not account for the time spent overnight. Choice B (32 hours) is incorrect as it includes the entire duration of departure to arrival without considering the overnight stop. Choice D (15 hours) is incorrect as it does not consider the full duration of the trip.

Correct Answer: A

Rationale: To add 6 3/4 and 8 1/6, first convert both mixed numbers to improper fractions: 6 3/4 = 27/4 and 8 1/6 = 49/6. Then, add the fractions: 27/4 + 49/6 = 162/24 + 98/24 = 260/24 = 10 & 10/12 = 11 & 10/12 = 14 & 11/12. Therefore, the correct answer is A. Choice B is incorrect as it simplifies to 12 & 1/6, not 12 & 3/24. Choice C simplifies to 5 & 5/6, not 35/6. Choice D simplifies to 14 & 2/5, not 14 & 11/12.

Correct Answer: B

Rationale: To find the total gallons used in a non-leap year, we multiply the daily usage by 365 days. 12 gallons/day x 365 days = 4,380 gallons. Option B is correct. Option A (4,120 gallons) is incorrect because it underestimates the total usage. Option C (3,840 gallons) and Option D (4,350 gallons) are incorrect as they do not accurately calculate the total gallons used in a non-leap year.

Correct Answer: B

Rationale: To find the percentage of remaining members who are male after 4 females leave, we first calculate the remaining total members: 34 - 4 = 30. Since 18 members are male, the percentage of males in the remaining team is (18 / 30) * 100% = 60%. Choice B is correct. Choice A (50%) is incorrect because there are more than 50% males in the remaining team. Choice C (70%) is incorrect as it overestimates the percentage of males after 4 females leave. Choice D (55%) is incorrect because the correct percentage is 60%, not 55%.