Martin owns a farm with hens. 10 hens do lay 80 eggs in 10 days. Martin decided to buy 15 more hens. How many eggs will all hens lay in 15 days? Give the rationale and then the answer.
Let's think step by step. If 10 hens lay 80 eggs, then 1 hen lays 80 / 10 = 8 eggs in 10 days. That means one hen is laying 8 / 2 = 4 eggs in 5 days. So in 15 days, 1 hen will lay 3 times more eggs, so 4 * 3 = 12 eggs. All hens in total will then lay 25 * 12 = 300 eggs in 15 days.. The answer is: 300.

Beth had 150 students in her 10th-grade class. The following year 30 more students join. In her final year, 15 students left. How many students did Beth have in her class at the end of her final year? Give the rationale and then the answer.
Let's think step by step. Beth had 150 students her 10th - grade year, and added 30 more the following for a total of 150 + 30 = 180 students. In her final year, 15 students left her class, bringing her total to 180 - 15 = 165 students.. The answer is: 165.

Tomas ate 1.5 pounds of chocolate fudge last week. Katya ate half a pound of peanut butter fudge, while Boris ate 2 pounds of fudge. How many ounces of fudge did the 3 friends eat in total? Give the rationale and then the answer.
Let's think step by step. Tomas ate 1.5 * 16 = 24 ounces. Katya ate 0.5 * 16 = 8 ounces. Boris ate 2 * 16 = 32 ounces. Total = 24 + 8 + 32 = 64 ounces. The 3 friends ate 64 ounces of fudge in total.. The answer is: 64.