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  3. a new photocopier works 4 times as fast as an old

A new photocopier works 4 times as fast as an old one. Whenthe machines work...

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Basic Math

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A new photocopier works 4 times as fast as an old one. Whenthe machines work together, a university can produce all its staffmanuals in 20 hr. Find the time it would take each machine,working alone, to complete the job.

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