At a tennis tournament there were boys and girls participating. Every player played every other player. The boys won times as many matches as the girls. It is known that there were no draws. Find .
At a tennis tournament there were $2n$ boys and $n$ girls participating. Every player played every other player. The boys won $\frac 75$ times as many matches as the girls. It is known that there were no draws. Find $n$.
Školjka 
boys and 
girls participating. Every player played every other player. The boys won 
times as many matches as the girls. It is known that there were no draws. Find