PSLELee had 2.5 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 = 18, 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 - 10) + (g + 17)
= g + g + g + 3g + g - 10 + 17
= (7 g + 7) cm
(b)
1 m = 100 cm
2.5 m = 250 cm
Total length of ribbon used if g = 18
= 7 g + 7
= 7(18) + 7
= 126 + 7
= 133 cm
Total length of ribbon not used
= 250 - 133
= 117 cm
1 cm = 0.01 m
117 cm = 1.17 m
Answer(s): (a) (7g + 7) cm; (b) 1.17 m