The first tank is 300 liters filled while the second tank is 450 liters filled. The second tank is only 45% filled. If the two tanks have the same capacity, how many more liters of water are needed to fill the two tanks? Give the rationale and then the answer.
Let's think step by step. Since 450 liters represents 45%, then each 1% is equal to 450 liters / 45 = 10 liters. Hence, the capacity of each tank is 10 liters x 100 = 1000 liters. So, the first tank needs 1000 - 300 = 700 liters of water more. While the second tank needs 1000 - 450 = 550 liters more. Therefore, 700 + 550 = 1250 liters of water are needed to fill the two tanks.. The answer is: 1250.

Tommy's home is worth 25% more than he bought it for. He sells it and buys a new house that costs $500,000. If he had to take a loan for the 75% he can't pay, how much did he buy his first house for? Give the rationale and then the answer.
Let's think step by step. He paid 25% of the new home price because 100 - 75 = 25. He paid $125,000 towards the new home because 500,000 x .25 = 125,000. Therefore he paid $100,000 for his first home because 125,000 / 1.25 = 100,000.. The answer is: 100000.

Georgia is sick and coughs 5 times a minute. Her brother Robert is also sick but he coughs twice as much as her. After 20 minutes, how many times have they coughed? Give the rationale and then the answer.
Let's think step by step. Robert coughs twice as much as Georgia who coughs 5 times so Robert coughs 2 * 5 = 10 coughs per minute. Georgia coughs 5 times and Robert coughs 10 times so together they cough 5 + 10 = 15 times per minute. After 20 minutes they will have coughed 15 * 20 = 300 coughs.. The answer is: 300.