Fans of online literature said that according to their knowledge of online literature, a mathematics book usually had a cover and an inner page, and the thickness of the paper on the inner page was usually between 0.2 to 0.5 centimeters. Therefore, a 60-sheet math book was about 240 to 300 centimeters long. For a math book with 600 sheets of paper, the thickness of each sheet of paper was about 0.2 cm, so the total thickness of 600 sheets of paper was about 1200 to 1500 cm. For a math book with 6000 sheets of paper, the thickness of each sheet of paper was about 0.2 centimeters, so the total thickness of 6000 sheets of paper was about 18000 to 20000 centimeters.