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