The 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 more leaflets did S print than R in 7 minutes?
- Both machines did not change their rates of printing throughout. When R had printed 200 leaflets, how many leaflets had S printed?
(a)
Machine R:
4 min → 40
Machine S:
4 min → 60
Machine S more than Machine R:
4 min → 60 - 40 = 20
1 min → 20 ÷ 4 = 5
7 min → 7 x 5 = 35
Number of leaflets that machine S printed more than Machine R in 7 min = 35
(b)
Machine R:
200 leaflets → 20 min
Machine S:
4 min → 60
1 min → 60 ÷ 4 = 15
20 min → 20 x 15 = 300
Number of leaflets that S had printed when R had printed 200 leaflets = 300
Answer(s): (a) 35; (b) 300