Question

百分比的算术题,我现在已经忘的差不多了、求高手解答

Answer 1

设他还要打x场才能有52%的胜率

(260+x)/(507+x)=52%

100(260+x)=52(507+x)

26000+100x=26364+52x

100x-52x=26364-26000

48x=364

x≈7.58

x=8

∴他还要打8场才能有52%的胜率