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 more leaflets did Z print than Y in 7 minutes?
- Both machines did not change their rates of printing throughout. When Y had printed 150 leaflets, how many leaflets had Z printed?
(a)
Machine Y:
10 min → 60
Machine Z:
10 min → 100
Machine Z more than Machine Y:
10 min → 100 - 60 = 40
1 min → 40 ÷ 10 = 4
7 min → 7 x 4 = 28
Number of leaflets that Machine Z printed more than Machine Y in 7 min = 28
(b)
Machine Y:
150 leaflets → 25 min
Machine Z:
10 min → 100
1 min → 100 ÷ 10 = 10
25 min → 25 x 10 = 250
Number of leaflets that Machine Z had printed when Machine Y had printed 150 leaflets = 250
Answer(s): (a) 28; (b) 250