PSLE
Mr Chau used two printers with different printing rates for a printing job. He started Printer T at 20 04 and started Printer U two minutes later. He stopped both printers at 20 09. The graphs show the total number of pages printed by each printer from the start of printing.

1. How many pages had been printed by Printer T at the time Mr Chau started Printer U?
2. What was the difference in the number of pages printed by the two printers from 20 04 to 20 09?
3. Which printer, T or U, has a faster printing rate? What is the difference in the number of pages printed by the printers in one minute? Give your answer in this format. (Eg A, 1)

(a)
At 20 06, number of pages that Printer T printed = 84

(b)
Number of pages printed by Printer T from 20 04 to 20 09
= 210

Number of pages printed by Printer U from 20 04 to 20 09
= 150

Difference in the number of pages printed by the two printers from 20 04 to 20 09
= 210 - 150
= 60

(c)
Printing rate of Printer T
= 210 ÷ 5
= 42

Printing rate of Printer U
= 150 ÷ 3
= 50 (Faster)

Difference in the number of pages printed by the printers in one minute
= 50 - 42
= 8

Answer(s): (a) 84; (b) 60; (c) U, 8