Q: A cat spends its time hunting birds. The cat catches 8 birds during the day and twice this many at night. In total, how many birds did the cat catch?
A: At night, the cat catches 8 birds * 2 = 16 birds. Combined with the birds caught during the day, the cat caught a total of 8 birds + 16 birds = 24 birds. The answer is 24.

Q: Janna sleeps 7 hours each day during weekdays and 8 hours each day during weekends. How many hours does she sleep in a week?
A: She sleeps 7 * 5 = 35 hours on weekdays. She sleeps 8 * 2 = 16 hours on weekends. 35 + 16 = 51 hours is the amount of time she sleeps in a week. The answer is 51.

Q: Emilia needs 42 cartons of berries to make a berry cobbler. She already has 2 cartons of strawberries and 7 cartons of blueberries in her cupboard. She decides to go to the supermarket to get more cartons. How many more cartons of berries should Emilia buy?
A:
She previously had 2 cartons + 7 cartons = 9 cartons of berries. Emilia needs to buy 42 cartons - 9 cartons = 33 cartons of berries. The answer is 33.