PSLEFabian had 2.4 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 = 15, 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 - 3) + (k + 12)
= k + k + k + 3k + k - 3 + 12
= (7 k + 9) cm
(b)
1 m = 100 cm
2.4 m = 240 cm
Total length of rope used if k = 15
= 7 k + 9
= 7(15) + 9
= 105 + 9
= 114 cm
Total length of rope not used
= 240 - 114
= 126 cm
1 cm = 0.01 m
126 cm = 1.26 m
Answer(s): (a) (7k + 9) cm; (b) 1.26 m