11 дощечек отпилили
Пошаговое объяснение:
Пусть количество дощечек было отпилено х.
1. 20х30х70 = 42000 (см³) - изначальный объём бруска
2. 6х20х30= 3600 (см³) - объем одной отпиленной дощечки
Составим уравнение:
42000 - 3600х = 2700
3600х = 42000 - 2700
3600х = 39300
х = 39300/3600
х = 10,92 = 11 (дощечек) отпилили
Значит, чтобы оставшийся брусок был объёмом менее 2700 см³, нужно отпилить 11 дощечек
Проверим:
42000 - 11*3600 = 42000 - 39600 = 2400 см³ объём оставшегося бруска (менее 2700 см³)
Если отпилить 10 дощечек, то:
42000 - 10*3600 = 42000 - 36000 = 6000 м³ объём оставшегося бруска (более 2700 см³)
Короче, вот:
PROJECT.
★WE ARE READY TO "HELP" YOU★
If we are attentive, we may find out, that there are a lot of things that we can do all around. The following activities could make our neighbourhood better and people’s life easier.
Carrying bags is a good way to help elderly people. It will be even better if you ask them what they need and go shopping yourself. There are some lonely pensioners in our neighbourhood.
They will also be happy if somebody helps them about the house. Cleaning the flat, washing up or repairing something is a good way to help them, too.
Sometimes there is a lot of snow in winter. If so, younger people can help clean the snow in the yard. Everyone will thank them for it, especially car owners.
It’s a good idea to clean the territory in the neighbourhood together with the friends. It’s not difficult, but if you pick up the rubbish in the yard once a month, it will be very effective.
There is so much waste paper everywhere, even in the postboxes. If we collectit and take to the recycling stations, it will save trees and make the neighbou.