Question: The pet store can buy a goldfish for $.25 and sell it for $.75. The owner plans to use the profits from goldfish sales to buy a new tank, which costs $100. After one week, he is 45% short of the price. How many goldfish did he sell that week?
Answer: Step-by-step reasoning process: He is $45 short because 100 x .45 = 45. He earned $55 off goldfish because 100 - 45 = 55. He makes $.5 profit per goldfish because .75 - .25 = .5. He sold 110 goldfish that week because 55 / .5 = 110.
So the answer is 110.

Question: Bob has planted corn in his garden, and it has just started to sprout. A week after planting it, it had grown 2 inches. The next week, its height increased by twice as much as it had the first week. In the third week, it grew 4 times as much as it did the week before. How tall are the corn plants now?
Answer: Step-by-step reasoning process: The second week it grew twice as much as the first week, so 2 * 2 inches = 4 inches. The third week it grew 4 times as much as in the second week, so 4 * 4 inches = 16 inches. In total, it grew 2 inches + 4 inches + 16 inches = 22 inches.
So the answer is 22.

Question: At a middle school, 20% of the students are in the band. If 168 students are in the band, how many students go to the middle school?
Answer: Step-by-step reasoning process: Let X be the number of students in the middle school. We know that X * 20% = 168 students are in the band. So there are X = 168 / 20% = 840 students in the middle school.
So the answer is 840.

Question: James paves a new parking lot. It is 400 feet by 500 feet. Only 80% of that is useable for parking. It takes 10 square feet to park a car. How many cars can be parked?
Answer:
Step-by-step reasoning process: The parking lot is 400 * 500 = 200,000. There are 200,000 * .8 = 160,000 square feet of parking space. That means he can park 16,0000 / 10 = 16000 cars.
So the answer is 16000.