To paste the room and the corridor bought 25 rolls of wallpaper. How many rolls will be used for pasting the walls

To paste the room and the corridor bought 25 rolls of wallpaper. How many rolls will be used for pasting the walls of the corridor if it needs 4 times less wallpaper than for a room?

In this problem, the total number and the relationship between the two quantities is known. Denote by x rolls the amount that went to pasting the corridor. Then 4 rolls – went for pasting the room. In total, 25 rolls were needed, that is, the sum of x and 4x is 25: x + 4x = 25
Answer: 5 rolls are needed for pasting the corridor.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.