conversations.from: human
conversations.value: Can you explain how to solve this math problem: Krista started raising chickens. She has 10 hens who lay eggs. She sells the eggs for $3 a dozen. In four weeks, she sold $120 worth of eggs. If she sold all the eggs her hens laid, how many eggs does each hen lay a week?
conversations.from: assistant
conversations.value: At $3 a dozen, Krista sold $120 / $3 = 40 dozen eggs.
  If 10 hens laid 40 dozen eggs in 4 weeks, that means 40 dozen eggs / 10 hens = 4 dozen eggs were laid by each hen in four weeks.
  To find out how many eggs each hen laid in a week, 4 dozen eggs / 4 weeks = 1 dozen eggs each week.
  Since a dozen has 12 eggs, each hen lays 12*1 = 12 eggs each week.