29 of a ribbon was used to tie a box. 18 cm was used for the ribbon knot.
- Find the length of the ribbon used.
- What was the original length of the ribbon?
(a)
Length of the ribbon used
= 11 x 2 + 9 x 2 + 7 x 4 + 18
= 86 cm
(b)
Original length of the ribbon = 9 u
Length used to tie the box = 2 u
2 u = 86 cm
1 u = 86 ÷ 2 = 43
Original length of the ribbon
= 9 u
= 43 x 9
= 387 cm
Answer(s): (a) 86 cm; (b) 387 cm