PSLELiam had 2.7 m of rope. He used some of it to make the figure as shown.
- How much of the rope did Andy use to make the figure? Leave your answer in the simplest form in terms of j.
- If j = 16, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= j + j + j + (3j - 10) + (j + 20)
= j + j + j + 3j + j - 10 + 20
= (7 j + 10) cm
(b)
1 m = 100 cm
2.7 m = 270 cm
Total length of rope used if j = 16
= 7 j + 10
= 7(16) + 10
= 112 + 10
= 122 cm
Total length of rope not used
= 270 - 122
= 148 cm
1 cm = 0.01 m
148 cm = 1.48 m
Answer(s): (a) (7j + 10) cm; (b) 1.48 m