PSLEThe graphs show the total number of leaflets machines S and T printed from the start. Both machines started printing at the same time.
- How many less leaflets did S print than T in 4 minutes?
- Both machines did not change their rates of printing throughout. When S had printed 250 leaflets, how many leaflets had T printed?
(a)
Machine S:
30 min → 150
Machine T:
30 min → 300
Machine S less than Machine T:
30 min → 300 - 150 = 150
1 min → 150 ÷ 30 = 5
4 min → 4 x 5 = 20
Number of leaflets that machine S printed less than Machine T in 4 min = 20
(b)
Machine S:
250 leaflets → 50 min
Machine T:
30 min → 300
1 min → 300 ÷ 30 = 10
50 min → 50 x 10 = 500
Number of leaflets that T had printed when S had printed 250 leaflets = 500
Answer(s): (a) 20; (b) 500