PSLEArchie had 3.2 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 g.
- If g = 13, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= g + g + g + (3g - 3) + (g + 20)
= g + g + g + 3g + g - 3 + 20
= (7 g + 17) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of ribbon used if g = 13
= 7 g + 17
= 7(13) + 17
= 91 + 17
= 108 cm
Total length of ribbon not used
= 320 - 108
= 212 cm
1 cm = 0.01 m
212 cm = 2.12 m
Answer(s): (a) (7g + 17) cm; (b) 2.12 m