PSLETom 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 g.
- If g = 19, 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 + 20)
= g + g + g + 3g + g - 10 + 20
= (7 g + 10) cm
(b)
1 m = 100 cm
3.8 m = 380 cm
Total length of ribbon used if g = 19
= 7 g + 10
= 7(19) + 10
= 133 + 10
= 143 cm
Total length of ribbon not used
= 380 - 143
= 237 cm
1 cm = 0.01 m
237 cm = 2.37 m
Answer(s): (a) (7g + 10) cm; (b) 2.37 m