How many liters are in 300 milliliters?

Correct Answer: C

Rationale: To convert milliliters to liters, you need to divide by 1000 since there are 1000 milliliters in 1 liter. Therefore, 300 milliliters · 1000 = 0.3 liters. Choice A, 0.03 liters, is the result of dividing by 10 instead of 1000. Choice B, 3 liters, is the result of multiplying instead of dividing. Choice D, 0.003 liters, is the result of dividing by 1000 twice, which is incorrect.

Correct Answer: B

Rationale: To find x in the proportion 40:5 = 60:x, set up the equation: 40/5 = 60/x. Cross-multiply to solve for x: 40x = 60 * 5 => 40x = 300. Divide by 40 to isolate x: x = 300 / 40 = 7.5. However, x should be a whole number since it represents a quantity, so x = 7. Therefore, the correct answer is 7 (B). Choices A, C, and D are incorrect as they do not satisfy the proportion equation.

Correct Answer: B

Rationale: To find 20% of 150, you need to multiply 150 by 0.20: 150 0.20 = 30. Therefore, 20% of 150 is indeed 30. Choice A (25) is incorrect as it represents 20% of 125, not 150. Choice C (35) is incorrect as it represents more than 20% of 150. Choice D (20) is incorrect as it is the original percentage to find.

Correct Answer: C

Rationale: In this question, the correct answer is C) 10/9. To add 2/3 and 4/9, we need to find a common denominator, which in this case is 9. When we convert 2/3 to have a denominator of 9, we get 6/9. Adding 6/9 and 4/9 gives us 10/9, which is the correct answer. Option A) 8/15 is incorrect because it does not represent the sum of 2/3 and 4/9 when added together. Option B) 1 is incorrect as it is not the result of adding 2/3 and 4/9. Option D) 1/2 is incorrect because it also does not represent the correct sum of 2/3 and 4/9. Understanding how to add fractions is crucial in pharmacology and various aspects of healthcare. In medication calculations, knowing how to manipulate fractions accurately is essential to ensure correct dosages are administered to patients. This math skill is fundamental for healthcare professionals to prevent medication errors and provide safe patient care.

Correct Answer: C

Rationale: To find the result of dividing 0.9 by 3, we perform the division operation, which equals 0.3. Therefore, the correct answer is 0.3. Choice A (0) is incorrect as the result is not zero, but 0.3. Choice B (3) is incorrect as 0.9 divided by 3 is not 3 but 0.3. Choice D (9) is incorrect as 0.9 divided by 3 is not 9 but 0.3.