25 of a string was used to tie a box. 12 cm was used for the string knot.
- Find the length of the string used.
- What was the original length of the string?
(a)
Length of the string used
= 12 x 2 + 9 x 2 + 7 x 4 + 12
= 82 cm
(b)
Original length of the string = 5 u
Length used to tie the box = 2 u
2 u = 82 cm
1 u = 82 ÷ 2 = 41
Original length of the string
= 5 u
= 41 x 5
= 205 cm
Answer(s): (a) 82 cm; (b) 205 cm