PSLEOliver had 3.2 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 = 19, 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 - 10) + (y + 18)
= y + y + y + 2y + y - 10 + 18
= (6 y + 8) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of wire used if y = 19
= 6 y + 8
= 6(19) + 8
= 114 + 8
= 122 cm
Total length of wire not used
= 320 - 122
= 198 cm
1 cm = 0.01 m
198 cm = 1.98 m
Answer(s): (a) (6y + 8) cm; (b) 1.98 m