[Question]: A 220-liter barrel has a small leak. It lost 10% of its contents before anyone noticed. How many liters are left in the barrel?
[Answer]: The barrel lost 220 * 10 / 100 = 22 liters before anyone noticed. So, 220 22 = 198 liters are left in the barrel.
So the answer is 198.

[Question]: Jenny wants to heat a dish for dinner. It needs to be at 100 degrees before it is ready to eat. It is 20 degrees when she places it in the oven, and it heats up 5 degrees every minute. How many minutes will it take to be ready?
[Answer]: To determine this, we must first figure out the required change in temperature. To do this, we perform 100 - 20 = 80 degrees of required temperature change. Next, we divide this amount by the rate of change per minute, performing 80 / 5 = 16 minutes of cooking time.
So the answer is 16.

[Question]: John takes a 20-foot log and cuts it in half. If each linear foot of the log weighs 150 pounds how much does each cut piece weigh?
[Answer]:
Each cut piece is 20 / 2 = 10 feet long. So they each weigh 10 * 150 = 1500 pounds.
So the answer is 1500.