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Question:

Six people can run 3 machines in the factory. How many machines can 18 people run?

A 9
Explaination

If 6 people can run 3 machines, then 18 people can run 3 times the number of machines 6 people can run because 18 = 3 × 6 (divide 18 by 6). 3 × 3 machines = 9 machines. 18 people can run 9 machines.