PSLEMichael 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 y.
- If y = 13, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= y + y + y + (3y - 8) + (y + 17)
= y + y + y + 3y + y - 8 + 17
= (7 y + 9) cm
(b)
1 m = 100 cm
2.5 m = 250 cm
Total length of ribbon used if y = 13
= 7 y + 9
= 7(13) + 9
= 91 + 9
= 100 cm
Total length of ribbon not used
= 250 - 100
= 150 cm
1 cm = 0.01 m
150 cm = 1.5 m
Answer(s): (a) (7y + 9) cm; (b) 1.5 m