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 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:
10 min → 80
Machine S:
10 min → 150
Machine S more than Machine R:
10 min → 150 - 80 = 70
1 min → 70 ÷ 10 = 7
7 min → 7 x 7 = 49
Number of leaflets that Machine S printed more than Machine R in 7 min = 49
(b)
Machine R:
200 leaflets → 25 min
Machine S:
10 min → 150
1 min → 150 ÷ 10 = 15
25 min → 25 x 15 = 375
Number of leaflets that Machine S had printed when Machine R had printed 200 leaflets = 375
Answer(s): (a) 49; (b) 375