ba kho chua 660 tan thoc .neu chuyen 30 tan tu kho thu nhat sang kho thu hai .sau do chuyen25 tan tu kho thu hai sang kho thu ba roi chuyen 12 tan tu kho thu ba sang kho thu nhat thi so thoc o ca ba kho bang kho bang nhau .tinh so thoc moi kho??? help me!