PSLEIan had 2.4 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 p.
- If p = 15, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= p + p + p + (3p - 5) + (p + 11)
= p + p + p + 3p + p - 5 + 11
= (7 p + 6) cm
(b)
1 m = 100 cm
2.4 m = 240 cm
Total length of ribbon used if p = 15
= 7 p + 6
= 7(15) + 6
= 105 + 6
= 111 cm
Total length of ribbon not used
= 240 - 111
= 129 cm
1 cm = 0.01 m
129 cm = 1.29 m
Answer(s): (a) (7p + 6) cm; (b) 1.29 m