PSLEVaidev had 3.5 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 b.
- If b = 27, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= b + b + b + (3b - 4) + (b + 11)
= b + b + b + 3b + b - 4 + 11
= (7 b + 7) cm
(b)
1 m = 100 cm
3.5 m = 350 cm
Total length of string used if b = 27
= 7 b + 7
= 7(27) + 7
= 189 + 7
= 196 cm
Total length of string not used
= 350 - 196
= 154 cm
1 cm = 0.01 m
154 cm = 1.54 m
Answer(s): (a) (7b + 7) cm; (b) 1.54 m