34 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 + 9 x 2 + 7 x 4 + 10
= 78 cm
(b)
Original length of the ribbon = 4 u
Length used to tie the box = 3 u
3 u = 78 cm
1 u = 78 ÷ 3 = 26
Original length of the ribbon
= 4 u
= 26 x 4
= 104 cm
Answer(s): (a) 78 cm; (b) 104 cm