PSLECharlie had 3.9 m of streamer. He used some of it to make the figure as shown.
- How much of the streamer did Andy use to make the figure? Leave your answer in the simplest form in terms of y.
- If y = 27, how much of the streamer was not used to make the figure? Leave your answer in meters.
(a)
Total length of streamer used
= y + y + y + (3y - 7) + (y + 12)
= y + y + y + 3y + y - 7 + 12
= (7 y + 5) cm
(b)
1 m = 100 cm
3.9 m = 390 cm
Total length of streamer used if y = 27
= 7 y + 5
= 7(27) + 5
= 189 + 5
= 194 cm
Total length of streamer not used
= 390 - 194
= 196 cm
1 cm = 0.01 m
196 cm = 1.96 m
Answer(s): (a) (7y + 5) cm; (b) 1.96 m