37 of a string was used to tie a box. 10 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 + 10 x 2 + 9 x 4 + 10
= 90 cm
(b)
Original length of the string = 7 u
Length used to tie the box = 3 u
3 u = 90 cm
1 u = 90 ÷ 3 = 30
Original length of the string
= 7 u
= 30 x 7
= 210 cm
Answer(s): (a) 90 cm; (b) 210 cm