PSLEGeorge had 2.3 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 k.
- If k = 16, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= k + k + k + (3k - 5) + (k + 13)
= k + k + k + 3k + k - 5 + 13
= (7 k + 8) cm
(b)
1 m = 100 cm
2.3 m = 230 cm
Total length of rope used if k = 16
= 7 k + 8
= 7(16) + 8
= 112 + 8
= 120 cm
Total length of rope not used
= 230 - 120
= 110 cm
1 cm = 0.01 m
110 cm = 1.1 m
Answer(s): (a) (7k + 8) cm; (b) 1.1 m