PSLEBobby had 3.4 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 n.
- If n = 13, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= n + n + n + (3n - 6) + (n + 11)
= n + n + n + 3n + n - 6 + 11
= (7 n + 5) cm
(b)
1 m = 100 cm
3.4 m = 340 cm
Total length of ribbon used if n = 13
= 7 n + 5
= 7(13) + 5
= 91 + 5
= 96 cm
Total length of ribbon not used
= 340 - 96
= 244 cm
1 cm = 0.01 m
244 cm = 2.44 m
Answer(s): (a) (7n + 5) cm; (b) 2.44 m