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28 October, 18:37

After every ninth visit to a restaurant you receive a free beverage. After every twelfth visit you receive a free appetizer. if you visit the restaurant 100 times, on witch visits will you receive a free beverage and a free appetizer? At which visit will you first receive a free beverage and a free appetizer

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  1. 28 October, 18:42
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    A common multiples problem.

    Multiples of 9 till 100:

    9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99

    Multiples of 12 till 100:

    12, 24, 36, 48, 60, 72, 84, 96

    Look for the common ones in 9 and 12:

    36 and 72

    So, on the 36th and the 72nd visit you'll get an appetizer and drink.

    So, on the 36th visit is the first time you'll get a free appetizer and drink.
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