25 of a ribbon was used to tie a box. 10 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 + 8 x 2 + 6 x 4 + 10
= 72 cm
(b)
Original length of the ribbon = 5 u
Length used to tie the box = 2 u
2 u = 72 cm
1 u = 72 ÷ 2 = 36
Original length of the ribbon
= 5 u
= 36 x 5
= 180 cm
Answer(s): (a) 72 cm; (b) 180 cm