Answer the following question.
Grace is filling her pool in the backyard with a hose that sprays 50 gallons/hour. She waited for 3 hours but the pool wasn't full, so she decides to add another hose that sprays 70 gallons/hour, and after 2 more hours the pool is full. How much water can Grace's pool contain?
Step-by-step reasoning process: In the first 3 hours the pool gets 50 gallons / hour x 3 hours = 150 gallons. With the addition of the other hose, the pool was filling with a rate of 50 gallons / hour + 70 gallons / hour = 120 gallons / hour. In the next 2 hours with both hoses the pool gets 120 gallons / hour x 2 hours = 240 gallons. The pool's total capacity is 240 gallons + 150 gallons = 390 gallons.
The answer is 390.

Answer the following 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?
Step-by-step reasoning process: The barrel lost 220 * 10 / 100 = 22 liters before anyone noticed. So, 220 22 = 198 liters are left in the barrel.
The answer is 198.

Answer the following question.
Martin went to a store to buy a new television set. He decided to spend no more than $1,000 and the sales clerk offered him the TV for $100 less and an additional 20% off. How much lower was the price of the television than the amount Martin decided to spend?
Step-by-step reasoning process: The seller has offered him the TV for 1000 - 100 = $900. The discount on the television was 900 * 20 / 100 = $180. The final price of the television is therefore 900 - 180 = $720. Martin was able to save 1000 - 720 = $280.
The answer is 280.

Answer the following question.
A flagpole is 12 feet tall. It breaks, folding over in half, such that what was the tip of the flagpole is now dangling two feet above the ground. How far from the base, in feet, did the flagpole break?
Step-by-step reasoning process: The break occurred (12 - 2) / 2 = 5 feet from the top. Then it was 12 - 5 = 7 feet from the base.
The answer is 7.