PSLEThe graphs show the total number of leaflets machines J and K printed from the start. Both machines started printing at the same time.
- How many less leaflets did J print than K in 7 minutes?
- Both machines did not change their rates of printing throughout. When J had printed 250 leaflets, how many leaflets had K printed?
(a)
Machine J:
10 min → 50
Machine K:
10 min → 80
Machine J less than Machine K:
10 min → 80 - 50 = 30
1 min → 30 ÷ 10 = 3
7 min → 7 x 3 = 21
Number of leaflets that machine J printed less than Machine K in 7 min = 21
(b)
Machine J:
250 leaflets → 50 min
Machine K:
10 min → 80
1 min → 80 ÷ 10 = 8
50 min → 50 x 8 = 400
Number of leaflets that K had printed when J had printed 250 leaflets = 400
Answer(s): (a) 21; (b) 400