PSLEOliver had 2.5 m of thread. He used some of it to make the figure as shown.
- How much of the thread did Andy use to make the figure? Leave your answer in the simplest form in terms of w.
- If w = 12, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= w + w + w + (2w - 10) + (w + 19)
= w + w + w + 2w + w - 10 + 19
= (6 w + 9) cm
(b)
1 m = 100 cm
2.5 m = 250 cm
Total length of thread used if w = 12
= 6 w + 9
= 6(12) + 9
= 72 + 9
= 81 cm
Total length of thread not used
= 250 - 81
= 169 cm
1 cm = 0.01 m
169 cm = 1.69 m
Answer(s): (a) (6w + 9) cm; (b) 1.69 m