Answer this question:Cynthia has three children whose ages add up to 35. Matthew is two years older than Rebecca and four years younger than Freddy. How many years old is Freddy?
Let A be Matthew’s age. Rebecca is A - 2 years old. Freddy is A + 4 years old. Their ages add up to 35, so A + A - 2 + A + 4 = 3A + 2 = 35. Therefore, 3A = 35 - 2 = 33. Matthew is A = 33 / 3 = 11 years old. Thus, Freddy is 11 + 4 = 15 years old.
The answer is 15.

Answer this question:A convenience store sold 100 bags of chips in a month. In the first week, 15 bags of chips were sold. In the second week, thrice as many bags of chips were sold. There was an equal number of chips sold in the third and fourth week. How many chips was each sold in the third and fourth week?
In the second week, 15 x 3 = 45 bags of chips were sold. So there was a total of 45 + 15 = 60 bags of chips sold on the first and second week. Thus, a total of 100 - 60 = 40 bags of chips were sold on the third and fourth week. Therefore, 40 / 2 = 20 bags of chips were each sold on the third and fourth week.
The answer is 20.

Answer this question:Nori had 4 boxes of crayons with 8 crayons in each box. She gave 5 crayons to Mae and also give some crayons to Lea. How many more crayons did she give to Lea than Mae if she has only 15 crayons left?
From the 4 boxes, Nori had 8 * 4 = 32 crayons. After giving 5 crayons to Mae, she had 32 - 5 = 27 crayons left. If she only has 15 crayons now, this means she gave Lea 27 - 15 = 12 crayons. Hence, Lea has 12 - 5 = 7 more crayons than Mae.
The answer is 7.

Answer this question:Janna sleeps 7 hours each day during weekdays and 8 hours each day during weekends. How many hours does she sleep in a week?

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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She sleeps 7 * 5 = 35 hours on weekdays. She sleeps 8 * 2 = 16 hours on weekends. 35 + 16 = 51 hours is the amount of time she sleeps in a week.
The answer is 51.