How many milliliters are in 3 liters?

Correct Answer: B

Rationale: The correct answer is B: 3000 milliliters. There are 1,000 milliliters in a liter. Therefore, 3 liters = 3 1,000 = 3,000 milliliters. Choice A (300 milliliters) is incorrect as it represents the conversion of 0.3 liters, not 3 liters. Choice C (1500 milliliters) is incorrect as it is halfway between the correct answer and a common mistake of confusing liters with milliliters. Choice D (300 milliliters) is incorrect as it is the conversion of 0.3 liters, not 3 liters.

Correct Answer: D

Rationale: The correct answer is D, 8 pounds. There are 16 ounces in a pound. To convert 128 ounces to pounds, you divide 128 by 16, which equals 8 pounds. Choice A, 16 pounds, is incorrect because that would be the conversion the other way around, from pounds to ounces. Choices B and C are incorrect as they do not reflect the correct conversion from ounces to pounds.

Correct Answer: D

Rationale: In this math problem, we are asked to find 75% of 80. To calculate this, we need to multiply 80 by 0.75 (which represents 75% as a decimal). The correct answer is D) 60. To arrive at this, you would perform the calculation: 80 * 0.75 = 60. Therefore, 60 is 75% of 80. Now, let's analyze why the other options are incorrect: A) 35 - This is not the correct answer because it is not the result of finding 75% of 80. B) 45 - This is incorrect as well because it does not represent 75% of 80. C) 70 - This option is incorrect because it is not the correct result of calculating 75% of 80. In an educational context, understanding percentages is crucial in various real-life situations, such as calculating discounts, tips, or understanding data trends. This question tests the ability to convert percentages to decimals and perform basic calculations. It is essential for students to grasp these foundational math concepts to succeed in more complex mathematical problems and real-world applications.

Correct Answer: D

Rationale: To convert kilograms to grams, you multiply by 1,000 since there are 1,000 grams in a kilogram. Therefore, 8 kilograms = 8 x 1,000 = 8,000 grams. The correct answer is 8,000 grams, which is option D. Choices A and C are incorrect as they incorrectly multiply by 10,000 instead of 1,000. Choice B is incorrect as it divides 8 by 10 instead of multiplying by 1,000.

Correct Answer: D

Rationale: In the given question, we are asked to solve for x in the equation x/5 = 3/10. To solve this equation, we can cross multiply to eliminate the fractions. This gives us 10x = 15. To isolate x, we divide both sides by 10, giving us x = 1.5. Therefore, the correct answer is D) x = 1.5. Let's analyze why the other options are incorrect: A) x = 0.6 - This answer is incorrect because it does not satisfy the equation x/5 = 3/10. B) x = 0.6 - This is a duplicate of option A and is also incorrect. C) x = 0.9 - This answer is incorrect as well since it does not satisfy the original equation x/5 = 3/10. Educational context: This question tests the student's understanding of solving equations involving fractions. It assesses their ability to manipulate fractions and solve for a variable. Understanding how to cross multiply and isolate the variable is crucial in solving these types of equations. Mastering these skills is essential for success in higher-level math courses and various quantitative fields.