PSLEHarry had 3.5 m of rope. He used some of it to make the figure as shown.
- How much of the rope did Andy use to make the figure? Leave your answer in the simplest form in terms of m.
- If m = 23, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= m + m + m + (2m - 9) + (m + 18)
= m + m + m + 2m + m - 9 + 18
= (6 m + 9) cm
(b)
1 m = 100 cm
3.5 m = 350 cm
Total length of rope used if m = 23
= 6 m + 9
= 6(23) + 9
= 138 + 9
= 147 cm
Total length of rope not used
= 350 - 147
= 203 cm
1 cm = 0.01 m
203 cm = 2.03 m
Answer(s): (a) (6m + 9) cm; (b) 2.03 m