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thangbamay0000
2 năm trước
bài 1: để hút cạn nước của 1 cái hồ người ta sử dụng 15 máy bơm làm việc trong 12 giờ . Hỏi nếu muốn hút cạn hồ đó chỉ trong 9 giờ thì cần phải sử dụng bao nhiêu máy bơm ? biết năng suất các máy bơm như nhau Bài 2 Một bếp ăn dự trữ gạo cho 150 công nhân ăn trong 30 ngày . Nay thêm 30 người nữa hỏi số gạo dữ trữ dó đủ ăn trong báo nhiêu ngày ? Bài 3: có 5 người thợ may , may trong 7 ngày may được 140 cái áo .Hỏi với 8 người thợ may trong 9 ngày thì được tất cả bao nhiêu cái áo ? bài 4 : để đánh dấu một quyển sách người ta dùng 579 chữ số . Hỏi quyển sách dày bao nhiêu trang ?
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