PSLEBobby had 3.5 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 = 22, 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 + (2y - 5) + (y + 12)
= y + y + y + 2y + y - 5 + 12
= (6 y + 7) cm
(b)
1 m = 100 cm
3.5 m = 350 cm
Total length of ribbon used if y = 22
= 6 y + 7
= 6(22) + 7
= 132 + 7
= 139 cm
Total length of ribbon not used
= 350 - 139
= 211 cm
1 cm = 0.01 m
211 cm = 2.11 m
Answer(s): (a) (6y + 7) cm; (b) 2.11 m