PSLEHarry had 3.8 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 j.
- If j = 10, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= j + j + j + (3j - 9) + (j + 19)
= j + j + j + 3j + j - 9 + 19
= (7 j + 10) cm
(b)
1 m = 100 cm
3.8 m = 380 cm
Total length of ribbon used if j = 10
= 7 j + 10
= 7(10) + 10
= 70 + 10
= 80 cm
Total length of ribbon not used
= 380 - 80
= 300 cm
1 cm = 0.01 m
300 cm = 3 m
Answer(s): (a) (7j + 10) cm; (b) 3 m