A cup is filled with 200g of alcohol, after pouring out 40g of alcohol for the first time, add 40g of water and shake well; after pouring out 40g of the mixture for the second time, add 40g of water again. What percentage of alcohol is in the alcohol mixture?
一个杯中盛满200g酒精，第一次倒掉40g酒精后，加进40g水摇匀；第二次再倒掉40g混合液后，又到进40g水．这时酒精混合液中含酒精几分之几？
<gadget id="calculator">200 - 40</gadget>
<output>160</output>

<gadget id="calculator">160 / 200</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * 40</gadget>
<output>32</output>

<gadget id="calculator">160 - 32</gadget>
<output>128</output>

<gadget id="calculator">128 / 200</gadget>
<output>16/25 = around 0.64</output>

<result>16/25 = around 0.64</result>