PSLEMichael had 2.7 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 y.
- If y = 24, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= y + y + y + (2y - 4) + (y + 15)
= y + y + y + 2y + y - 4 + 15
= (6 y + 11) cm
(b)
1 m = 100 cm
2.7 m = 270 cm
Total length of wire used if y = 24
= 6 y + 11
= 6(24) + 11
= 144 + 11
= 155 cm
Total length of wire not used
= 270 - 155
= 115 cm
1 cm = 0.01 m
115 cm = 1.15 m
Answer(s): (a) (6y + 11) cm; (b) 1.15 m