25 of a wire was used to tie a box. 16 cm was used for the wire knot.
- Find the length of the wire used.
- What was the original length of the wire?
(a)
Length of the wire used
= 12 x 2 + 9 x 2 + 8 x 4 + 16
= 90 cm
(b)
Original length of the wire = 5 u
Length used to tie the box = 2 u
2 u = 90 cm
1 u = 90 ÷ 2 = 45
Original length of the wire
= 5 u
= 45 x 5
= 225 cm
Answer(s): (a) 90 cm; (b) 225 cm