Question: The battery charge in Mary’s cordless vacuum cleaner lasts ten minutes. It takes her four minutes to vacuum each room in her house. Mary has three bedrooms, a kitchen, and a living room. How many times does Mary need to charge her vacuum cleaner to vacuum her whole house?
Answer with step-by-step thinking: Mary has 3 + 1 + 1 = 5 rooms in her house. At 4 minutes a room, it will take her 4 * 5 = 20 minutes to vacuum her whole house. At 10 minutes a charge, she will need to charge her vacuum cleaner 20 / 10 = 2 times to vacuum her whole house.
So the answer is 2.


Question: Jerry paid off some of his debts. Two months ago, he paid $12 while last month, he paid $3 more. If his debt was $50 in all, how much does he still have to pay?
Answer with step-by-step thinking: Jerry paid $12 + $3 = $15 last month. He paid a total of $12 + $15 = $27 for two months. Therefore, Jerry still has to pay $50 - $27 = $23.
So the answer is 23.


Question: Dorothy spent $53 to buy doughnut ingredients. If she made 25 doughnuts and sells each for $3, how much was her profit?
Answer with step-by-step thinking:

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 was able to earn 25 x $3 = $75 for the doughnuts. Therefore, Dorothy's profit is $75 - $53 = $22.
So the answer is 22.