The graphs show the total number of leaflets machines C and D printed from the start. Both machines started printing at the same time.
- How many more leaflets did D print than C in 7 minutes?
- Both machines did not change their rates of printing throughout. When C had printed 200 leaflets, how many leaflets had D printed?
(a)
Machine C:
15 min → 120
Machine D:
15 min → 150
Machine D more than Machine C:
15 min → 150 - 120 = 30
1 min → 30 ÷ 15 = 2
7 min → 7 x 2 = 14
Number of leaflets that machine D printed more than Machine C in 7 min = 14
(b)
Machine C:
200 leaflets → 25 min
Machine D:
15 min → 150
1 min → 150 ÷ 15 = 10
25 min → 25 x 10 = 250
Number of leaflets that D had printed when C had printed 200 leaflets = 250
Answer(s): (a) 14; (b) 250