PSLEPeter had 2.5 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 = 16, 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 + (3x - 5) + (x + 20)
= x + x + x + 3x + x - 5 + 20
= (7 x + 15) cm
(b)
1 m = 100 cm
2.5 m = 250 cm
Total length of thread used if x = 16
= 7 x + 15
= 7(16) + 15
= 112 + 15
= 127 cm
Total length of thread not used
= 250 - 127
= 123 cm
1 cm = 0.01 m
123 cm = 1.23 m
Answer(s): (a) (7x + 15) cm; (b) 1.23 m