25 of a rope was used to tie a box. 10 cm was used for the rope knot.
- Find the length of the rope used.
- What was the original length of the rope?
(a)
Length of the rope used
= 11 x 2 + 9 x 2 + 7 x 4 + 10
= 78 cm
(b)
Original length of the rope = 5 u
Length used to tie the box = 2 u
2 u = 78 cm
1 u = 78 ÷ 2 = 39
Original length of the rope
= 5 u
= 39 x 5
= 195 cm
Answer(s): (a) 78 cm; (b) 195 cm