The length, width and height of the rectangular gift box are 30cm, 20cm and 8cm respectively How many centimeters of ribbon do you need

The length, width and height of the rectangular gift box are 30cm, 20cm and 8cm respectively How many centimeters of ribbon do you need

Length = 2 × 30 + 2 × 20 + 4 × 8 + 15
=60+40+32+15
=147cm
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How many centimeters does it take to tie a 30cm long, 12cm wide and 12cm high gift box with colored tape? (ribbon knot length 15cm)

30 × 2 + 12 × 2 + 12 × 4 + 15, = 60 + 24 + 48 + 15, = 84 + 48 + 15, = 147 (CM); a: 147 cm

A 20 cm long, 15 cm wide and 10 cm high gift box. How long does it need to be tied with colored tape at least? (20 cm is used at the knot)

（15+10）*2+（20+10）*2
=50+60
=110（cm）
110+20=130（cm）