PSLEJustin had 2.6 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 g.
- If g = 14, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= g + g + g + (3g - 9) + (g + 14)
= g + g + g + 3g + g - 9 + 14
= (7 g + 5) cm
(b)
1 m = 100 cm
2.6 m = 260 cm
Total length of wire used if g = 14
= 7 g + 5
= 7(14) + 5
= 98 + 5
= 103 cm
Total length of wire not used
= 260 - 103
= 157 cm
1 cm = 0.01 m
157 cm = 1.57 m
Answer(s): (a) (7g + 5) cm; (b) 1.57 m