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 3 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 → 50
Machine S:
10 min → 150
Machine R less than Machine S:
10 min → 150 - 50 = 100
1 min → 100 ÷ 10 = 10
3 min → 3 x 10 = 30
Number of leaflets that machine R printed less than Machine S in 3 min = 30
(b)
Machine R:
250 leaflets → 50 min
Machine S:
10 min → 150
1 min → 150 ÷ 10 = 15
50 min → 50 x 15 = 750
Number of leaflets that S had printed when R had printed 250 leaflets = 750
Answer(s): (a) 30; (b) 750