The 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 4 minutes?
- Both machines did not change their rates of printing throughout. When Y had printed 200 leaflets, how many leaflets had Z printed?
(a)
Machine Y:
15 min → 120
Machine Z:
15 min → 150
Machine Z more than Machine Y:
15 min → 150 - 120 = 30
1 min → 30 ÷ 15 = 2
4 min → 4 x 2 = 8
Number of leaflets that machine Z printed more than Machine Y in 4 min = 8
(b)
Machine Y:
200 leaflets → 25 min
Machine Z:
15 min → 150
1 min → 150 ÷ 15 = 10
25 min → 25 x 10 = 250
Number of leaflets that Z had printed when Y had printed 200 leaflets = 250
Answer(s): (a) 8; (b) 250