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.

There are 4 trains waiting at a train station and each train has 4 carriages. Each carriage has 3 rows of wheels and the rows of wheels have 5 wheels each. How many wheels are at the train station? Give the rationale and then the answer.
Let's think step by step. Each carriage has 3 rows of wheels * 5 wheels per row = 15 wheels. So each train has 4 carriages * 15 wheels per carriage = 60 wheels. There is therefore a total of 4 trains * 60 wheels per train = 240 wheels at the train station.. The answer is: 240.

Betsy won 5 games of Monopoly. Helen won twice as many as Betsy and Susan won three times as many as Betsy. Between them, how many games have they won? Give the rationale and then the answer.
Let's think step by step. Helen won twice as many games as Betsy's 5 so Helen won 2 * 5 = 10 games. Susan won three times as many games as Betsy's 5 so Susan won 3 * 5 = 15 games. When you combine their wins, together they won 5 + 10 + 15 = 30 games total.. The answer is: 30.