PSLEThe 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 less leaflets did C print than D in 7 minutes?
- Both machines did not change their rates of printing throughout. When C had printed 250 leaflets, how many leaflets had D printed?
(a)
Machine C:
10 min → 50
Machine D:
10 min → 80
Machine C less than Machine D:
10 min → 80 - 50 = 30
1 min → 30 ÷ 10 = 3
7 min → 7 x 3 = 21
Number of leaflets that machine C printed less than Machine D in 7 min = 21
(b)
Machine C:
250 leaflets → 50 min
Machine D:
10 min → 80
1 min → 80 ÷ 10 = 8
50 min → 50 x 8 = 400
Number of leaflets that D had printed when C had printed 250 leaflets = 400
Answer(s): (a) 21; (b) 400