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 250 leaflets, how many leaflets had S printed?
(a)
Machine R:
10 min → 100
Machine S:
10 min → 200
Machine R less than Machine S:
10 min → 200 - 100 = 100
1 min → 100 ÷ 10 = 10
9 min → 9 x 10 = 90
Number of leaflets that machine R printed less than Machine S in 9 min = 90
(b)
Machine R:
250 leaflets → 25 min
Machine S:
10 min → 200
1 min → 200 ÷ 10 = 20
25 min → 25 x 20 = 500
Number of leaflets that S had printed when R had printed 250 leaflets = 500
Answer(s): (a) 90; (b) 500