PSLEBilly had 3.1 m of ribbon. He used some of it to make the figure as shown.
- How much of the ribbon did Andy use to make the figure? Leave your answer in the simplest form in terms of h.
- If h = 15, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= h + h + h + (3h - 3) + (h + 15)
= h + h + h + 3h + h - 3 + 15
= (7 h + 12) cm
(b)
1 m = 100 cm
3.1 m = 310 cm
Total length of ribbon used if h = 15
= 7 h + 12
= 7(15) + 12
= 105 + 12
= 117 cm
Total length of ribbon not used
= 310 - 117
= 193 cm
1 cm = 0.01 m
193 cm = 1.93 m
Answer(s): (a) (7h + 12) cm; (b) 1.93 m