A farmer has 240 acres under cultivation at the cost of $188.99 per acre. If he averages a yield of 60 bushels per acre, what profit is expected if the price per bushel is $5.67?

Correct Answer: A

Rationale: To calculate the profit, first find the total revenue: 240 acres 60 bushels/acre $5.67/bushel = $81,648. Then, calculate the total cost: 240 acres $188.99/acre = $45,357.60. Finally, subtract the cost from the revenue to find the profit: $81,648 - $45,357.60 = $36,290.40. Therefore, the expected profit is $36,290.40. Choice B, $45,357.60, is the total cost, not the profit. Choice C, $81,648, is the total revenue, not the profit. Choice D, $44,000, is an arbitrary figure and not related to the calculations provided. Thus, the correct answer is $36,290.40.

Correct Answer: B

Rationale: To solve for x, first, subtract 2 from both sides of the equation: 4x = 16. Then, divide by 4 to isolate x: x = 4. Choice A, x = 4, is the correct answer as calculated. Choice C, x = 5, is incorrect because the correct value of x is 4, not 5. Choice D, x = 3, is incorrect as well, as the correct value of x is 4, not 3.

Correct Answer: A

Rationale: The correct answer is A: 2.5 liters. There are 1,000 milliliters in a liter. To convert 2,500 milliliters to liters, you need to divide by 1,000: 2,500 / 1,000 = 2.5 liters. Choice B (1.5 liters) is incorrect because it miscalculates the conversion. Choice C (3.5 liters) is incorrect as it overestimates the conversion. Choice D (0.25 liters) is incorrect as it underestimates the conversion. Therefore, the correct conversion is 2.5 liters.

Correct Answer: C

Rationale: To calculate the total number of words typed in 20 minutes, multiply the typing speed per minute (45 words) by the duration in minutes (20 minutes): 45 words/min 20 min = 900 words. Therefore, the correct answer is 900 words. Choices A, B, and D are incorrect because they do not reflect the accurate calculation based on the given information.

Correct Answer: A

Rationale: In this question, the correct answer is A) 7000 mg. To explain why this answer is correct, we need to understand the conversion factor between grams and milligrams. There are 1000 milligrams in 1 gram. So, to convert grams to milligrams, we multiply the number of grams by 1000. In this case, 7 grams x 1000 = 7000 mg. Now, let's analyze why the other options are incorrect: B) 7 mg: This option is incorrect because it is the same value as the given amount in grams, not the conversion to milligrams. C) 700 mg: This option is incorrect because it is one order of magnitude lower than the correct answer. It does not account for the conversion factor of 1000. D) 70 mg: This option is incorrect because it is two orders of magnitude lower than the correct answer. It also does not consider the conversion factor. Educationally, understanding basic unit conversions like grams to milligrams is essential in various fields, especially in science and healthcare. It is crucial for students to grasp these conversions to work accurately with measurements and quantities. By practicing such questions, students reinforce their understanding of these fundamental concepts and improve their quantitative reasoning skills.