已知直线 l: x=my+n(n>0) 过点 A(53,5) ，若可行域 {x≤my+nx−3y≥0y≥0 的外接圆直径为20，则 n= _1．_刷题宝

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已知直线 l: x=my+n(n>0) 过点 A(53,5) ，若可行域 {x≤my+nx−3y≥0y≥0 的外接圆直径为20，则 n= ____．

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