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Exercises

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The Postman (example5)

The postman A distributes all letters in 45 minutes. If his assistent helps him, it takes only 20 minutes. How long would the assistent alone take?

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How old is Peter (example3a)

The age of Peter is a third of his father’s age, but in 10 years his father will only be two times as old as Peter will be. What is Peter’s age today?

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