PSLE Math 2020 Paper 2 Question 11

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(Photocopying Machines Time Rates Question)

PSLE Math 2020 Paper 2 Question 11

PSLE Math working on machine comparison using pages, time, and efficiency; applies to advanced problem sum practice and time-speed topics.

(a) Ans: 1512

Machine P (Part 1)
1 s -> 2 pages
7 min -> 2 x 420 = 840

 Machine Q (Part 2)
5 s -> 7 pages
1 min (60 s) -> 7 x 12 = 84
8 min -> 84 x 8 = 672

Total -> 840 + 672 = 1512

(b) Ans: 18 min

Q
1 min -> 84 pages
? min -> 1512 รท 84 = 18