PSLEWarren had 2.4 m of thread. He used some of it to make the figure as shown.
- How much of the thread did Andy use to make the figure? Leave your answer in the simplest form in terms of b.
- If b = 18, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= b + b + b + (2b - 10) + (b + 13)
= b + b + b + 2b + b - 10 + 13
= (6 b + 3) cm
(b)
1 m = 100 cm
2.4 m = 240 cm
Total length of thread used if b = 18
= 6 b + 3
= 6(18) + 3
= 108 + 3
= 111 cm
Total length of thread not used
= 240 - 111
= 129 cm
1 cm = 0.01 m
129 cm = 1.29 m
Answer(s): (a) (6b + 3) cm; (b) 1.29 m