Lan co mot so banh duoc xep vao cac hop. Neu xep moi hop 5 cai thi thua 2 cai. Neu xep moi hop 7 cai thi cung thua 2 cai nhung con 2 hop khong  co chiec nao. Hoi Lan co bao nhieu chiec banh?

mot nguoi mua 5 hop but chi mau,loai moi hop co 8 chiec va 5 hop but ch mau,loai moi hpo co 12 chiec.hoi nguoi do da mua tat ca bao nhieu chiecbut chi mau

but chi mau cung loai moi hop co nhieu hon 2 but chi nhung it hon 6 but chi tinh ra lop da mua 120 but chi mau 6b mua duoc 130 but mau hoi moi hop mau co bao chiec

nguoi ta do trong long mot chiec hop dang HHCN co chieu dai 6 cm chieu rong 4 cm chieu ca 5 cm hoi co the xep duoc bao nhieu hinh lap phuong1 cm3 de day chiec hop do

Ngoc va Minh moi nguoi mua mot so hop but chi mau , trong moi hop but chi mau , trong moi hop deu co tu hai but tro len va so but o cac hop deu bang nhau . Tinh ra Ngoc mua 20 but , Minh mua 15 but . Hoi moi hop but chi mau co bao nhieu chiec ?

nguoi ta do trong long 1 chiec hop dang hinh hop chu nhat co chieu dai 6cm chieu rong 4cm chieu cao 5cm hoi co the xep duoc bao nhieu hinh lap phuong 1dm khoi de day chiec hop do

mot chiec hop can nang 12,8 kg dung nhung chiec but giong nhau neu hop rong no nang 800 g biet khoi luong trung binh cua nhung chiec but 160 g hoi co bao nhieu chiec but trong hop

co giao mua 4 hop banh nhu nhau duoc 100 cai banh co lay 3 hop chia deu cho tat ca cac ban trong lop 3a moi ban duoc 3 chiec banh hoi lop 3a co tat ca bao nhieu ban