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العدد بأربع مرات من المشكلات التي أجابت عليها مارثا هو 4 × 2 = 8.
لذا، أجابت جينا على 8 - 2 = 6 مشكلات.
عدد المشكلات التي أجاب عنها مارك هو 6 ÷ 2 = 3.
العدد الإجمالي للمشكلات التي أجاب عنها مارثا وجينا ومارك هو 2 + 6 + 3 = 11.
قول هذا يَعني أن أنجيلا استطاعت أن تجيب على 20 - 11 = 9 مشكلات.
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