35 of a string was used to tie a box. 18 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
= 10 x 2 + 9 x 2 + 7 x 4 + 18
= 84 cm
(b)
Original length of the string = 5 u
Length used to tie the box = 3 u
3 u = 84 cm
1 u = 84 ÷ 3 = 28
Original length of the string
= 5 u
= 28 x 5
= 140 cm
Answer(s): (a) 84 cm; (b) 140 cm