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?
How many dozen eggs did Krista sell? ** At $3 a dozen, Krista sold $120 / $3 = <<120/3=40>>40 dozen eggs.
How many eggs did each hen lay in four weeks? ** If 10 hens laid 40 dozen eggs in 4 weeks, that means 40 dozen eggs / 10 hens = <<40/10=4>>4 dozen eggs were laid by each hen in four weeks.
How many eggs does each hen lay in a week? ** To find out how many eggs each hen laid in a week, 4 dozen eggs / 4 weeks = <<4/4=1>>1 dozen eggs each week.
How many eggs does each hen lay each week? ** Since a dozen has 12 eggs, each hen lays 12*1 = <<12*1=12>>12 eggs each week.
#### 12