The third solution, in order to carry out our recycling programme, is to buy bins for each type of waste, so that all the rooms of our school have the four types. After checking all the rooms and areas of the school, we need 140 bins of 15 litres: 35 yellow bins, 35 blue bins, 35 brown bins and 35 grey bins. Apart from that, we also need organic bins for the playgrounds and a big green bin and a small brown bin for the teacher's room.