PSLEThe graphs show the total number of leaflets machines R and S printed from the start. Both machines started printing at the same time.
- How many less leaflets did R print than S in 9 minutes?
- Both machines did not change their rates of printing throughout. When R had printed 300 leaflets, how many leaflets had S printed?
(a)
Machine R:
6 min → 60
Machine S:
6 min → 90
Machine R less than Machine S:
6 min → 90 - 60 = 30
1 min → 30 ÷ 6 = 5
9 min → 9 x 5 = 45
Number of leaflets that Machine R printed less than Machine S in 9 min = 45
(b)
Machine R:
300 leaflets → 30 min
Machine S:
6 min → 90
1 min → 90 ÷ 6 = 15
30 min → 30 x 15 = 450
Number of leaflets that Machine S had printed when Machine R had printed 300 leaflets = 450
Answer(s): (a) 45; (b) 450