PSLEJeremy had 2.8 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 c.
- If c = 21, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= c + c + c + (2c - 10) + (c + 19)
= c + c + c + 2c + c - 10 + 19
= (6 c + 9) cm
(b)
1 m = 100 cm
2.8 m = 280 cm
Total length of ribbon used if c = 21
= 6 c + 9
= 6(21) + 9
= 126 + 9
= 135 cm
Total length of ribbon not used
= 280 - 135
= 145 cm
1 cm = 0.01 m
145 cm = 1.45 m
Answer(s): (a) (6c + 9) cm; (b) 1.45 m