Reasoning and answer: First find the total number of baby minks: 30 minks * 6 babies / mink = 180 minks. Add this to the number of adult minks: 180 minks + 30 minks = 210 minks. Then divide this number in half to find how many aren't set free: 210 minks / 2 = 105 minks. Then divide the remaining number of minks by the number of minks per coat to find the number of coats: 105 minks / 15 minks / coat = 7 coats.
The answer: 7
What was the question?
Question: It takes 15 mink skins to make a coat. Andy buys 30 minks and each mink has 6 babies, but half the total minks are set free by activists. How many coats can he make?


First find the total number of rings in a ring group: 2 rings + 4 rings = 6 rings. Then subtract the number of ring groups in the second tree from the number in the first tree to find the difference: 70 groups - 40 groups = 30 groups. Then multiply that number by the number of rings in a group to find the difference in the trees' ages: 30 groups * 6 rings / group = 180 rings, or 180 years.
The answer: 180
Reverse engineering the question: Billy is counting the rings in two trees. Weather fluctuations in this area mean that each tree's rings are in groups of two fat rings and four thin rings. If Billy counts 70 ring groups in the first tree and 40 ring groups in the second tree, how much older is the first tree? (Trees grow 1 ring per year.)


Reasoning and answer: Ignatius has 8 tires because 2 x 4 = 8. His friend has 24 tires because 3 x 8 = 24. There are 20 bicycle wheels because 24 - 1 - 3 = 20. He has 10 bicycles because 20 / 2 = 10.
The answer: 10
What was the question?
Question: Ignatius owns 4 bicycles. A friend of his owns different types of cycles, which have three times are many tires as Ignatius's bikes have. He has one unicycle, a tricycle, and the rest are bikes. How many bicycles does the friend own?


The number of cats on the street is 2 / 3 * 300 = 200. If there are 300 animals on the street, and 200 are cats, there are 300 - 200 = 100 dogs. Since a dog has four legs, the total number of legs the 100 dogs have is 100 * 4 = 400 legs.
The answer: 400
Reverse engineering the question: Two-thirds of all the animals on my street are cats and the rest are dogs. If there are 300 animals on the street, what's the total number of legs of dogs that are on the street?


Reasoning and answer: He deposited 2000 * 52 = $104,000 into his account. So he has 250000 + 104000 = $354,000. His windfall is worth .5 * 354,000 = $177,000 more than his current account. That means he got 177,000 + 354,000 = $531,000. So he had a total of 531,000 + 354,000 = $885,000.
The answer: 885000
What was the question?
Question: James invests $2000 a week into his bank account. He had $250,000 in his account when the year started. At the end of the year, he gets a windfall that is worth 50% more than what he has in his bank account.  How much money does he have?


Reasoning and answer: If each bulb uses 60 watts each day, the 40 bulbs that Allyn has uses 60 * 40 = 2400 watts of power each day. In June, with 30 days, the bulbs will use 30 * 2400 = 72000 watts of power. If Allyn is charged an electricity bill of twenty cents per power watt used, in June she will pay 72000 * $0.20 = $14400.
The answer: 14400
What was the question?
Question:

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.
user
A sixty bulb watt uses 60 watts of power each day. If Allyn has 40 such bulbs in his house and pays an electricity bill of twenty cents per power watt used, calculate Allyn's total monthly expenses on electricity in June.