Samuel took 30 minutes to finish his homework while Sarah took 1.3 hours to finish it. How many minutes faster did Samuel finish his homework than Sarah?
Let's think: Since there are 60 minutes in 1 hour, then 1.3 hours is equal to 1.3 x 60 = 78 minutes. Thus, Samuel is 78 – 30 = 48 minutes faster than Sarah.. The answer is: 48.

In Henry's collection of music CDs, he has 3 more country CDs than rock CDs but twice as many rock CDs as classical CDs. If he has 23 country CDs, how many classical CDs make up his collection?
Let's think: Henry has 23 - 3 = 20 rock CDs. Henry has 20 / 2 = 10 classical CDs.. The answer is: 10.

John decides to replace all his hats. He has enough hats to wear a different one every day for 2 weeks. If each hat costs $50 how much do his hats cost?
Let's think: He has 2 * 7 = 14 hats. So they cost 14 * 50 = $700.. The answer is: 700.

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?
Let's think:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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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.