Question

Учебник гармония Н. Б. Истомина 4-класс первая часть с. 63 номер 168 задача Для ремонта коридора и комнаты купили 25 рулонов обоев. Сколько рулонов пойдёт на окленивание стен в комнате , если для неё нужно в 4 раза больше обоев, чем для коридора? помогите решить почему умножают 25 на 4?

Answer 1

25 на 4 умножать не нужно
в коридор 1 часть обоев, в комнату-4 части. Всего 5 частей
25:5=5рулонов составляет 1 часть
5*4=20 рулонов пойдёт на комнату

Answer 2

According to my search results, I couldn't find the specific textbook "Гармония" by Н.Б. Истомина for the 4th grade. However, I can help you with the math problem you mentioned.

The problem states that 25 rolls of wallpaper were purchased for the renovation of a corridor and a room. The question is how many rolls of wallpaper will be needed to cover the walls of the room if it requires 4 times more wallpaper than the corridor.

To solve this problem, we can use the concept of ratios. Let's assume that the number of rolls needed for the corridor is x. Since the room requires 4 times more wallpaper, the number of rolls needed for the room would be 4x.

To find the total number of rolls needed, we can add the number of rolls for the corridor and the room: x + 4x = 5x.

Since we know that 25 rolls were purchased in total, we can set up the equation 5x = 25 and solve for x.

Dividing both sides of the equation by 5, we get x = 5.

Therefore, the number of rolls needed for the corridor is 5, and the number of rolls needed for the room is 4 times that, which is 4 * 5 = 20.

So, to answer your question, 25 rolls of wallpaper will be enough to cover the walls of the room if 4 times more wallpaper is needed for the room than for the corridor.

I hope this helps! Let me know if you have any further questions.