Eighty-five friends went to a party where they were offered
three drinks: Vodka, Whisky, and Rum. It was known that
20 of them took all the 3 drinks, and 55 of them took at
least 2 of the 3 drinks. Each drink cost * 1000, and the total
receipt of the party was 145000.
A. How many friends did not try any of the drinks?
B. How many friends took exactly one drink?
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15 friends took exactly one drink
15 friends did not try any of the drink
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