PSLEThe graphs show the total number of leaflets machines D and E printed from the start. Both machines started printing at the same time.
- How many less leaflets did D print than E in 7 minutes?
- Both machines did not change their rates of printing throughout. When D had printed 250 leaflets, how many leaflets had E printed?
(a)
Machine D:
10 min → 50
Machine E:
10 min → 150
Machine D less than Machine E:
10 min → 150 - 50 = 100
1 min → 100 ÷ 10 = 10
7 min → 7 x 10 = 70
Number of leaflets that machine D printed less than Machine E in 7 min = 70
(b)
Machine D:
250 leaflets → 50 min
Machine E:
10 min → 150
1 min → 150 ÷ 10 = 15
50 min → 50 x 15 = 750
Number of leaflets that E had printed when D had printed 250 leaflets = 750
Answer(s): (a) 70; (b) 750