PSLEAhmad had 3.7 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 f.
- If f = 29, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= f + f + f + (3f - 9) + (f + 13)
= f + f + f + 3f + f - 9 + 13
= (7 f + 4) cm
(b)
1 m = 100 cm
3.7 m = 370 cm
Total length of rope used if f = 29
= 7 f + 4
= 7(29) + 4
= 203 + 4
= 207 cm
Total length of rope not used
= 370 - 207
= 163 cm
1 cm = 0.01 m
163 cm = 1.63 m
Answer(s): (a) (7f + 4) cm; (b) 1.63 m