PSLEHenry had 3.8 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 = 12, 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 + (3m - 3) + (m + 20)
= m + m + m + 3m + m - 3 + 20
= (7 m + 17) cm
(b)
1 m = 100 cm
3.8 m = 380 cm
Total length of ribbon used if m = 12
= 7 m + 17
= 7(12) + 17
= 84 + 17
= 101 cm
Total length of ribbon not used
= 380 - 101
= 279 cm
1 cm = 0.01 m
279 cm = 2.79 m
Answer(s): (a) (7m + 17) cm; (b) 2.79 m