school = {'1а'=>20, '1б'=>21, '2а'=>15, '2б'=>33, '3а'=>23, '3б'=>31, '4а'=>25, '4б'=>32} print("#{school}\n") # {"1а"=>20, "1б"=>21, "2а"=>15, "2б"=>33, "3а"=>23, "3б"=>31, "4а"=>25, "4б"=>32} school['1а'] += 1 school['1б'] -= 2 school['2а'] -= 1 school['2б'] += 2 school['3а'] += 1 school['3б'] -= 2 school['4а'] -= 1 school['4б'] += 2 print("#{school}\n") # {"1а"=>21, "1б"=>19, "2а"=>14, "2б"=>35, "3а"=>24, "3б"=>29, "4а"=>24, "4б"=>34} s=0 school.each do |form, number| s+=number end print("Всього #{s} дітей \n") # Всього 200 дітей