PSLEBobby had 3.4 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 m.
- If m = 13, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= m + m + m + (3m - 10) + (m + 18)
= m + m + m + 3m + m - 10 + 18
= (7 m + 8) cm
(b)
1 m = 100 cm
3.4 m = 340 cm
Total length of string used if m = 13
= 7 m + 8
= 7(13) + 8
= 91 + 8
= 99 cm
Total length of string not used
= 340 - 99
= 241 cm
1 cm = 0.01 m
241 cm = 2.41 m
Answer(s): (a) (7m + 8) cm; (b) 2.41 m