PSLEJeremy had 3.3 m of wire. He used some of it to make the figure as shown.
- How much of the wire did Andy use to make the figure? Leave your answer in the simplest form in terms of a.
- If a = 30, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= a + a + a + (3a - 6) + (a + 11)
= a + a + a + 3a + a - 6 + 11
= (7 a + 5) cm
(b)
1 m = 100 cm
3.3 m = 330 cm
Total length of wire used if a = 30
= 7 a + 5
= 7(30) + 5
= 210 + 5
= 215 cm
Total length of wire not used
= 330 - 215
= 115 cm
1 cm = 0.01 m
115 cm = 1.15 m
Answer(s): (a) (7a + 5) cm; (b) 1.15 m