PSLEElijah had 3.1 m of rope. He used some of it to make the figure as shown.
- How much of the rope did Andy use to make the figure? Leave your answer in the simplest form in terms of w.
- If w = 19, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= w + w + w + (2w - 5) + (w + 12)
= w + w + w + 2w + w - 5 + 12
= (6 w + 7) cm
(b)
1 m = 100 cm
3.1 m = 310 cm
Total length of rope used if w = 19
= 6 w + 7
= 6(19) + 7
= 114 + 7
= 121 cm
Total length of rope not used
= 310 - 121
= 189 cm
1 cm = 0.01 m
189 cm = 1.89 m
Answer(s): (a) (6w + 7) cm; (b) 1.89 m