Question: Roberto is raising chickens for eggs. He buys 4 chickens for $20 each. They cost $1 in total a week to feed and each produces 3 eggs a week that will last forever. He used to buy 1 dozen eggs a week and spent $2 per dozen. After how many weeks will the chickens be cheaper than buying his eggs?
Answer: Step-by-step reasoning process: The chickens cost $80 because 4 x 20 = 80. His chickens produce a dozen eggs a week because 4 x 3 = 12. Each week that he has chickens is $1 cheaper than buying eggs because 2 - 1 = 1. After 80 weeks his chickens will be paid off because 80 / 1 = 80. After 81 weeks the chickens will be cheaper than buying eggs because 80 + 1 = 81.
So the answer is 81.

Question: Dave breaks 2 guitar strings per night when playing live. If he performs 6 shows a week for 12 weeks, how many guitar strings will he need to replace?
Answer: Step-by-step reasoning process: He breaks 2 strings a night for 6 nights for a total of 2 * 6 = 12 broken strings. He breaks 12 strings per week so over 12 weeks, he will need to replace 12 * 12 = 144 guitar strings.
So the answer is 144.

Question: There were 20 fishermen in the lake who had cast their net to catch fish. If they caught 10000 fish in total, and 19 of them caught 400 fish each with their own net, calculate the number of fish the twentieth fisherman caught.
Answer: Step-by-step reasoning process: The 19 fishermen who caught 400 fish each caught 400 * 19 = 7600 fish. If they caught a total of 10000 fish, the twentieth fisherman caught 10000 - 7600 = 2400 fish alone.
So the answer is 2400.

Question: Jane purchased 15 ice cream cones and 5 cups of pudding. Each ice cream cone cost $5 and each cup of pudding cost $2. How much more did Jane spend on ice cream than on pudding, in dollars?
Answer:
Step-by-step reasoning process: The cost of 15 cones of ice cream was 15 × $5 = $75. The cost of the 5 cups of pudding was 5 × $2 = $10. Jane spent $75 - $10 = $65 more on ice cream than on pudding.
So the answer is 65.