29 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
= 10 x 2 + 9 x 2 + 7 x 4 + 12
= 78 cm
(b)
Original length of the string = 9 u
Length used to tie the box = 2 u
2 u = 78 cm
1 u = 78 ÷ 2 = 39
Original length of the string
= 9 u
= 39 x 9
= 351 cm
Answer(s): (a) 78 cm; (b) 351 cm