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Tie up a rectangular gift box of 30cm in length, 20cm in width and 5cm in height with ribbon. The ribbon at the knot is 15cm in length. How many centimeters of ribbon do you need Is the length, width and height × 4, plus 15cm?
【1】 Length * 2 + width * 2 + height * 4 + knot length
=135 cm
【2】 The shortest binding method is 140cm
(30 times 2) plus (20 times 2) plus (5 times 4) plus 15 is 135
If it is practical operation, the ribbon should be added a little more at the interlaced place under the box, so it needs to be cut a little more than 135
【3】 30x2 = 60 (CM) 20x2 = 40 (CM) 5X4 = 20 (CM) 60 + 40 + 20 + 15 = 135 (CM)
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