23 of a string was used to tie a box. 16 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 + 16
= 86 cm
(b)
Original length of the string = 3 u
Length used to tie the box = 2 u
2 u = 86 cm
1 u = 86 ÷ 2 = 43
Original length of the string
= 3 u
= 43 x 3
= 129 cm
Answer(s): (a) 86 cm; (b) 129 cm