PSLEHarry 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 t.
- If t = 15, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= t + t + t + (3t - 8) + (t + 13)
= t + t + t + 3t + t - 8 + 13
= (7 t + 5) cm
(b)
1 m = 100 cm
2.7 m = 270 cm
Total length of rope used if t = 15
= 7 t + 5
= 7(15) + 5
= 105 + 5
= 110 cm
Total length of rope not used
= 270 - 110
= 160 cm
1 cm = 0.01 m
160 cm = 1.6 m
Answer(s): (a) (7t + 5) cm; (b) 1.6 m