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A faster machine completes printing the same number of documents in 70 minutes while a slower machine can print the same number of documents in 100 minutes. What is the total number of documents printed by the 2 machines given that the faster machine prints 6 more documents per minute than the slower machine?

- The ratio of speeds of the faster machine to slower machine is 100:70 or 10:7.

- The difference in units = 10-7=3

- 3 units - 6 documents

- 1 unit - 2 documents

- Speed of slower machine = 2*7=14 documents per minute.

- Total no of documents printed by the 2 machines = 14*100*2=2800

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