Net Gains Riddle

Susan and Lisa decided to play tennis against each other. They bet $1 on each game they played.
Susan won three bets and Lisa won $5.
How many games did they play?

Answer: 11 games.

Explanation:
Each game moves $1. Susan won 3 games → +$3 for Susan.
Lisa finished up $5 overall, so Lisa must have won 8 games (since 8−3=58 – 3 = 5).
Total games =8+3=11= 8 + 3 = 11.

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