2.1. Vasya bought a ticket to a compartment carriage for the first time. Thinking that each compartment has 6 seats, Vasya decided that his compartment has number 5. In which compartment can Vasya's seat actually be, if it is known that each compartment has 4 seats? List all possible options.
Answer: 7,8 (All answers)

Solution. If each compartment in the carriage has 6 seats, then compartment number 5 contains seats 25 to 30. Your seat can be any of these six. In the current carriage, where each compartment has 4 seats, seats 25, 26, 27, and 28 will be in compartment number 7, and seats 29 and 30 will be in compartment number 8.