PSLELiam 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 j.
- If j = 15, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= j + j + j + (3j - 8) + (j + 16)
= j + j + j + 3j + j - 8 + 16
= (7 j + 8) cm
(b)
1 m = 100 cm
2.4 m = 240 cm
Total length of ribbon used if j = 15
= 7 j + 8
= 7(15) + 8
= 105 + 8
= 113 cm
Total length of ribbon not used
= 240 - 113
= 127 cm
1 cm = 0.01 m
127 cm = 1.27 m
Answer(s): (a) (7j + 8) cm; (b) 1.27 m