The students in a school decided to collect old books to donate to schools in villages around the country. During the year, they collected a lot of books and were able to donate 345 books to 306 schools each. If there are 30 students in class A and each student in the class collected 32 books, then how many books were collected by the students of other classes?

Billy, Ashley and Brytney are practicing for the school races. Billy is the youngest, and can run a lap in 495 seconds. Ashley can run a lap in 225 seconds. The oldest student, Brytney can run a lap in 135 seconds. They start running at the same time from the starting line. After how many seconds will they all meet at the starting line?

The students in a school decided to collect old books to donate to schools in villages around the country. During the year, they collected a lot of books and were able to donate 130 books to 344 schools each. If there are 25 students in class A and each student in the class collected 45 books, then how many books were collected by the students of other classes?

There were 357 travelers on a flight to New York. If they all paid the same amount and the total cost of all their air tickets is J$10718211, how much does each traveler pay?

A tank of water contains 89 l 920 ml of water. There's a hole in the bottom of the tank through which 4 l and 400 ml water leaks away every hour. How many liters of water is left in the tank after 3 hours?