PSLEAhmad had 2.3 m of string. He used some of it to make the figure as shown.
- How much of the string 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 string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= x + x + x + (3x - 6) + (x + 11)
= x + x + x + 3x + x - 6 + 11
= (7 x + 5) cm
(b)
1 m = 100 cm
2.3 m = 230 cm
Total length of string used if x = 11
= 7 x + 5
= 7(11) + 5
= 77 + 5
= 82 cm
Total length of string not used
= 230 - 82
= 148 cm
1 cm = 0.01 m
148 cm = 1.48 m
Answer(s): (a) (7x + 5) cm; (b) 1.48 m