PSLEOscar had 3.9 m of ribbon. He used some of it to make the figure as shown.
- How much of the ribbon did Andy use to make the figure? Leave your answer in the simplest form in terms of k.
- If k = 17, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= k + k + k + (2k - 10) + (k + 16)
= k + k + k + 2k + k - 10 + 16
= (6 k + 6) cm
(b)
1 m = 100 cm
3.9 m = 390 cm
Total length of ribbon used if k = 17
= 6 k + 6
= 6(17) + 6
= 102 + 6
= 108 cm
Total length of ribbon not used
= 390 - 108
= 282 cm
1 cm = 0.01 m
282 cm = 2.82 m
Answer(s): (a) (6k + 6) cm; (b) 2.82 m