HESI A2
HESI A2 Math Portion Questions
Question 1 of 5
Convert this military time to regular time: 2120 hours.
Correct Answer: B
Rationale:
To convert military time to regular time, subtract 12 from the hours if the time is in the afternoon or evening. In this case, 21 - 12 = 9, so 2120 hours is equivalent to 9:20 P.M.
Therefore, the correct answer is option B, 9:20 P.M.
Choices A, C, and D are incorrect because they do not correctly adjust the military time to regular time format.
Choice A shows 9:20 A.M., which is incorrect as the time is in the evening.
Choices C and D show times that are not derived from the given military time, making them incorrect as well.
Question 2 of 5
In his stamp collection, Bruno has 15 more stamps from Europe than from Africa, and 18 more stamps from Asia than from Africa. If he has 27 stamps from Europe, how many Asian stamps does he have?
Correct Answer: C
Rationale: Since Bruno has 27 stamps from Europe, which is 15 more than from Africa, he must have 27 - 15 = 12 stamps from Africa. Since he also has 18 more stamps from Asia than from Africa, he must have 12 + 18 = 30 stamps from Asia.
Therefore, Bruno has 30 Asian stamps.
Choice A (12) is the number of stamps Bruno has from Africa, not Asia.
Choices B (22) and D (40) are not derived from the correct calculations based on the given information.
Question 3 of 5
Relatively prime numbers share no common factors other than 1. Which of the following pairs of numbers are relatively prime?
Correct Answer: B
Rationale:
Rationale:
- Relatively prime numbers are numbers that share no common factors other than 1.
-
To determine if two numbers are relatively prime, we need to find the greatest common divisor (GC
D) of the two numbers. If the GCD is 1, then the numbers are relatively prime.
- Let's calculate the GCD for each pair of numbers:
A) GCD(12, 16) = 4, not relatively prime
B) GCD(15, 17) = 1, relatively prime
C) GCD(20, 24) = 4, not relatively prime
D) GCD(28, 36) = 4, not relatively prime
Therefore, the pair of numbers 15 and 17 are relatively prime because their greatest common divisor is 1, meaning they share no common factors other than 1.
Question 4 of 5
If he left a tip of $36 on a total bill of $200, what percentage of the total bill did he leave as a tip?
Correct Answer: B
Rationale:
To determine the tip percentage left, divide the tip amount ($36) by the total bill amount ($200), then multiply the result by 100 to express it as a percentage: (36/200) x 100 = 18%.
Therefore, he left an 18% tip on the total bill amount.
Choice A (16%) is incorrect because the correct calculation results in 18%.
Choice C (20%) and
Choice D (22%) are incorrect as they do not match the calculated percentage based on the provided numbers.
Question 5 of 5
A patient's oxygen flow rate is set at 4 liters per minute. How many cubic centimeters of oxygen are delivered per minute?
Correct Answer: B
Rationale: 1 liter is equal to 1,000 cubic centimeters.
Therefore, when the oxygen flow rate is 4 liters per minute, the calculation is 4 x 1,000 = 4,000 cubic centimeters. Hence, at a flow rate of 4 liters per minute, 4,000 cubic centimeters of oxygen are delivered per minute.
Choice A, 400 cubic centimeters, is incorrect because it miscalculates the conversion from liters to cubic centimeters.
Choices C and D, 40,000 cubic centimeters and 400,000 cubic centimeters, respectively, are significantly higher than the correct answer due to incorrect conversions or additional errors in calculation.