Ming has played 20 games and has a winning rate of 95%. If he doesn't lose a game in the future, how many games does he need to win to make the winning rate reach 96%.
明已经进行了20场比赛，并且胜率为95%．若以后一场都不输，他还需要赢多少场比赛，才能使胜率达到96%．
<gadget id="calculator">96 / 100</gadget>
<output>24/25 = around 0.96</output>

<gadget id="calculator">20 * (24/25)</gadget>
<output>96/5 = around 19.2</output>

<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">20 * (19/20)</gadget>
<output>19</output>

<gadget id="calculator">(96/5) - 19</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (24/25)</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">(1/5) / (1/25)</gadget>
<output>5</output>

<result>5</result>