Roberto is raising chickens for eggs

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?

GSM8K — Grade School Math 8K (Cobbe et al., OpenAI, 2021) · train #7241