Q: John buys 30 ducks for $10 each. They weigh 4 pounds and he sells them for $5 per pound. How much profit did he make?
A: 300
Step-by-step reasoning process: He bought the ducks for 30 * 10 = $300. He sold each duck for 4 * 5 = $20. So he sold all the ducks for 30 * 20 = $600. So he made a profit of 600 - 300 = $300.


Q: John decides to stop delivering the newspapers he is supposed to deliver and instead steals them to recycle them for cash. The Monday-Saturday papers weigh 8 ounces each. The Sunday paper weighs twice as much. He is supposed to deliver 250 papers a day. He doesn't deliver them for 10 weeks. If one ton of paper recycles for $20, how much did he make?
A: 100
Step-by-step reasoning process: We know that 7 - 1 = 6 days the paper weighs 8 ounces. So those contribute 6 * 8 = 48 ounces per week. So in total a weekly delivery of papers weighs 48 + 16 = 64 ounces. That means it weighs 64 / 16 = 4 pounds. So each week he delivers 4 * 250 = 1000 pounds of paper. So in 10 weeks, he delivers 10 * 1000 = 10000 pounds of paper. That weighs 10000 / 2000 = 5 tons of paper. So he makes 5 * 20 = $100 from recycling the paper.


Q: James pays $1000 for advertising. It brought 100 customers to his site and 80% of those bought something at the store that cost $25. How much profit does he gain from the ad?
A: 1000
Step-by-step reasoning process: 100 * .8 = 80 customers bought something. That means they were worth 80 * 25 = $2000. So he gained 2000 - 1000 = $1000 from the ad.


Q: Brenda weighs 10 pounds more than 3 times Mel's weight. If Brenda weighs 220 pounds, what is Mel's weight?
A: 70

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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Step-by-step reasoning process: Let Mel's weight be m. Brenda’s weight is 3 * m + 10 = 220 pounds. Thus 3m = 220 - 10 = 210 pounds. Therefore Mel's weight is m = 210 / 3 = 70 pounds.