Puzzles / Riddles / Quiz Question

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1.In each round of a certain game of 2 people, the winner scores W points and the loser scores L points ( W L 0 ), ties are not allowed and all scores are integral.After several rounds, Alpha leads Mama by a score of 30 to 25. If Mama has won exactly 2 rounds, then what will be the value of W ? Please help at the earliest, I need it for a competition... Thank you very much for thinking and helping me... Heartwalker.