PSLEReggie had 3.1 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 x.
- If x = 11, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= x + x + x + (2x - 9) + (x + 16)
= x + x + x + 2x + x - 9 + 16
= (6 x + 7) cm
(b)
1 m = 100 cm
3.1 m = 310 cm
Total length of thread used if x = 11
= 6 x + 7
= 6(11) + 7
= 66 + 7
= 73 cm
Total length of thread not used
= 310 - 73
= 237 cm
1 cm = 0.01 m
237 cm = 2.37 m
Answer(s): (a) (6x + 7) cm; (b) 2.37 m