PSLEElijah had 2.4 m of wire. He used some of it to make the figure as shown.
- How much of the wire 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 wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= w + w + w + (3w - 5) + (w + 13)
= w + w + w + 3w + w - 5 + 13
= (7 w + 8) cm
(b)
1 m = 100 cm
2.4 m = 240 cm
Total length of wire used if w = 12
= 7 w + 8
= 7(12) + 8
= 84 + 8
= 92 cm
Total length of wire not used
= 240 - 92
= 148 cm
1 cm = 0.01 m
148 cm = 1.48 m
Answer(s): (a) (7w + 8) cm; (b) 1.48 m