PSLEJohn had 2.5 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 = 11, 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 + 19)
= k + k + k + 2k + k - 10 + 19
= (6 k + 9) cm
(b)
1 m = 100 cm
2.5 m = 250 cm
Total length of ribbon used if k = 11
= 6 k + 9
= 6(11) + 9
= 66 + 9
= 75 cm
Total length of ribbon not used
= 250 - 75
= 175 cm
1 cm = 0.01 m
175 cm = 1.75 m
Answer(s): (a) (6k + 9) cm; (b) 1.75 m