KöMaL 2013 K369
At the beginning of a business meeting, everyone exchanged business cards with everyone. Mr. George joined the company later on. Since he knew some of the participants, he only gave his card to those he did not know, but he did not receive a card from anyone. Thus the total number of cards given out increased by 12.5% relative to the situation before his arrival. How many participants were there after the arrival of Mr. George?
Official text KöMaL. Quoted with source.
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