PSLEArchie had 2.9 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 b.
- If b = 23, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= b + b + b + (2b - 7) + (b + 15)
= b + b + b + 2b + b - 7 + 15
= (6 b + 8) cm
(b)
1 m = 100 cm
2.9 m = 290 cm
Total length of wire used if b = 23
= 6 b + 8
= 6(23) + 8
= 138 + 8
= 146 cm
Total length of wire not used
= 290 - 146
= 144 cm
1 cm = 0.01 m
144 cm = 1.44 m
Answer(s): (a) (6b + 8) cm; (b) 1.44 m