[ Tournaments and tournament tables ] [ Problems on percentages and ratios ]

In a volleyball tournament, which was held in a round-robin format, $20 \%$ of all teams did not win a single game. How many teams were there

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Can it happen that two teams did not win a single game?

## Solution

Note that there cannot be two teams that did not win a single game. Indeed, in the match between these teams, one of them won. Thus, $20 \%$ (that is, $1 / 5$) of the total number of teams is one team.

## Answer

5 teams.