Answer the following question.
Ms. Jones got thank you cards from 30% of her class. 1/3 of these contained a gift card for $10. If she got $50 in gift cards, how many students were in her class?
Step-by-step reasoning process: She got 5 gift cards because 50 / 10 = 5. She got 15 thank you cards because 5 / (1 / 3) = 15. She has 50 students because 15 / .3 = 50.
The answer is 50.

Answer the following question.
Amanda's car takes five fewer minutes to complete the same trip to the beach than the bus. If the bus takes 40 minutes to drive 80 miles to the beach, how many minutes will it take the car to make a round trip?
Step-by-step reasoning process: If the bus takes 40 minutes to complete 80 miles of a trip, Amanda's car, which takes five fewer minutes to complete a trip than the bus, will take 40 - 5 = 35 minutes to complete the trip. A round trip will take the car twice the time for going one way, a total of 35 + 35 = 70.
The answer is 70.

Answer the following question.
Mr. Lu owns a computer store. For last month, half of their sales are laptops, one-third are netbooks, and the rest are desktop computers. If Mr. Lu's store was able to sell a total of 72 computers, how many of them are desktop computers?
Step-by-step reasoning process: There were 72 / 2 = 36 laptops sold. There were 72 / 3 = 24 netbooks sold. So, there were a total of 36 + 24 = 60 laptops and netbooks sold. Thus, 72 - 60 = 12 desktop computers were sold last month.
The answer is 12.

Answer the following question.
William is a jockey. He can ride his horse for 6 hours a day. Over 6 days, he only used the maximum riding time twice. On two days he rode his horse for only 1.5 hours a day and half the maximum time for the next two days. How many hours did William ride his horse during those 6 days?
Step-by-step reasoning process: William used two days to the limit, which means 6 * 2 = 12 hours of horse riding. For two days he rode a horse 1.5 a day, which makes up to 1.5 * 2 = 3 hours. For the next two days, he used only half of the maximum time which means 6 * 0.5 = 3 hours a day. That means 2 * 3 = 6 hours during these two days. So in total William rode his horse for 12 + 3 + 6 = 21 hours.
The answer is 21.