Father played chess with uncle. For a won game, the winner received 8 crowns from the opponent, and for a draw, nobody got anything. Uncle won four times, there were five draws, and in the end, father earned 24 crowns.

How many games did father play with uncle?

(M. Volfová)
Father lost four times, so he had to pay his uncle $4 \cdot 8=32$ crowns.

However, Father won so many times that even after paying these 32 crowns, he still gained 24 crowns. His total winnings were $32+24=56$ crowns, so he won $56: 8=7$ games.

Father won seven times, lost four times, and drew five times, so he played a total of $7+4+5=16$ games with his uncle.

Suggested scoring. 2 points for determining Father's total winnings; 2 points for the number of games Father won; 2 points for the total number of games played.