PSLEThe graphs show the total number of leaflets machines W and X printed from the start. Both machines started printing at the same time.
- How many less leaflets did W print than X in 7 minutes?
- Both machines did not change their rates of printing throughout. When W had printed 250 leaflets, how many leaflets had X printed?
(a)
Machine W:
10 min → 100
Machine X:
10 min → 200
Machine W less than Machine X:
10 min → 200 - 100 = 100
1 min → 100 ÷ 10 = 10
7 min → 7 x 10 = 70
Number of leaflets that machine W printed less than Machine X in 7 min = 70
(b)
Machine W:
250 leaflets → 25 min
Machine X:
10 min → 200
1 min → 200 ÷ 10 = 20
25 min → 25 x 20 = 500
Number of leaflets that X had printed when W had printed 250 leaflets = 500
Answer(s): (a) 70; (b) 500