PSLEThe graphs show the total number of leaflets machines X and Y printed from the start. Both machines started printing at the same time.
- How many less leaflets did X print than Y in 4 minutes?
- Both machines did not change their rates of printing throughout. When X had printed 250 leaflets, how many leaflets had Y printed?
(a)
Machine X:
30 min → 150
Machine Y:
30 min → 300
Machine X less than Machine Y:
30 min → 300 - 150 = 150
1 min → 150 ÷ 30 = 5
4 min → 4 x 5 = 20
Number of leaflets that machine X printed less than Machine Y in 4 min = 20
(b)
Machine X:
250 leaflets → 50 min
Machine Y:
30 min → 300
1 min → 300 ÷ 30 = 10
50 min → 50 x 10 = 500
Number of leaflets that Y had printed when X had printed 250 leaflets = 500
Answer(s): (a) 20; (b) 500