John decides to buy some birds. He got 50 dollars from each of his 4 grandparents. If each bird costs $20, how many wings did all the birds have? Give the rationale and then the answer.
Let's think step by step. He got 4 * 50 = $200. That means he was able to buy 200 / 20 = 10 birds. Since each bird has 2 wings he got 10 * 2 = 20 wings.. The answer is: 20.

Martiza is studying for the citizenship test. There are 60 questions on the test. 30 are multiple-choice and 30 are fill-in-the-blank. It takes her 15 minutes to learn each multiple-choice question and 25 minutes each to learn the fill-in-the-blank questions. How many hours will she need to study before she is ready for the test? Give the rationale and then the answer.
Let's think step by step. The multiple - choice questions will take her a total of 30 * 15 = 450 minutes. The fill - in - the - blank questions will take her a total of 25 * 30 = 750 minutes. The test will take her a total of 450 + 750 = 1200 minutes to study for. Therefore, Martiza will need to study a total of 1200 / 60 minutes = 20 hours.. The answer is: 20.

Jenson and Kingsley have a tailoring business. Jenson makes 3 shirts, and Kingsley makes 5 pairs of pants per day. If each shirt uses 2 yards of fabric and a pair of pants uses 5 yards of fabric, how many yards of fabric do they need every 3 days? Give the rationale and then the answer.
Let's think step by step. Jenson uses 2 x 3 = 6 yards of fabric for making shirts every day. Kingsley uses 5 x 5 = 25 yards of fabric every day for making pair of pants. So, the total yards of fabric they use per day is 25 + 6 = 31. Therefore, the total yards of fabric they use every 3 days is 31 x 3 = 93.. The answer is: 93.