PSLEReggie had 2.5 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 s.
- If s = 16, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= s + s + s + (3s - 7) + (s + 20)
= s + s + s + 3s + s - 7 + 20
= (7 s + 13) cm
(b)
1 m = 100 cm
2.5 m = 250 cm
Total length of wire used if s = 16
= 7 s + 13
= 7(16) + 13
= 112 + 13
= 125 cm
Total length of wire not used
= 250 - 125
= 125 cm
1 cm = 0.01 m
125 cm = 1.25 m
Answer(s): (a) (7s + 13) cm; (b) 1.25 m