PSLEArchie 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 m.
- If m = 23, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= m + m + m + (2m - 5) + (m + 15)
= m + m + m + 2m + m - 5 + 15
= (6 m + 10) cm
(b)
1 m = 100 cm
3.4 m = 340 cm
Total length of ribbon used if m = 23
= 6 m + 10
= 6(23) + 10
= 138 + 10
= 148 cm
Total length of ribbon not used
= 340 - 148
= 192 cm
1 cm = 0.01 m
192 cm = 1.92 m
Answer(s): (a) (6m + 10) cm; (b) 1.92 m