Bài 18. Một hình chữ nhật có diện tích là 180 cm, nếu tăng chiều dài 2 cm thi chu vi tăng 28 cm. Tính chu vi hình chữ nhật ban đầu. Bài 19. Ba rổ có số cam bằng nhau. Nếu bán 60 quả ở rổ thứ nhất, bán 45 quả ở rổ thứ 2 và 75 quả ở rổ thứ 3 thì số cam còn lại nhiều hơn số cam đã bán là 30 quả. Hỏi lúc đầu mỗi rổ có bao nhiêu quả? Bài 20: Có 5 thùng kẹo, mỗi thùng có 6 hộp kẹo, mỗi hộp có 32 viên kẹo. Hỏi có tất cả bao nhiêu viên kẹo? Bài 21: Có 8 bạn nhỏ đi mua bi, mỗi bạn mua 3 bi xanh và 4 bi đỏ. Hỏi 8 bạn mua tất cả bao nhiêu viên bi? Bài 22: Có 5 thùng kẹo như nhau chứa tổng cộng 720 viên kẹo, mỗi thùng kẹo có 6 gói. Hỏi mỗi gói chứa bao nhiêu viên kẹo?

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