Lao is farming chickens. He can sell each chicken for $1.50. A bag of chicken feed weighs 20 pounds and costs $2. Each chicken will need 2 pounds of feed from the time it hatches to the time he sells it. If he makes $65 profit from selling chickens, how many did he sell?
Think hard. Detailed solution:
50
A bag of feed is enough for 10 chickens because 20 / 2 = 10.

Each chicken costs $.

2 to raise because 2 / 10 =.

2.

Each chicken results in $1.

3 of profit because 1.

5 -.

2 = 1.

3.

He sells 50 chickens because 65 / 1.

3 = 50.

.

Thus, the answer is 50