There are two cups, A and B. Cup A contains 100 grams of alcohol with a concentration of 64%, and cup B contains 50 grams of water. Pour half of cup A into cup B for the first time, and then pour half of cup B into it after mixing. Pour it into cup A, what is the concentration of alcohol in cup A at this time.
有甲、乙两个杯子，甲杯装有浓度为64%的酒精100克，乙杯装有水50克，第一次将甲杯的一半倒给乙杯，混合后再将乙杯的一半倒给甲杯，此时甲杯酒精的浓度为多少．
<gadget id="calculator">64 / 100</gadget>
<output>16/25 = around 0.64</output>

<gadget id="calculator">(16/25) / 2</gadget>
<output>8/25 = around 0.32</output>

<gadget id="calculator">100 * (8/25)</gadget>
<output>32</output>

<gadget id="calculator">32 / 2</gadget>
<output>16</output>

<gadget id="calculator">32 + 16</gadget>
<output>48</output>

<gadget id="calculator">48 / 100</gadget>
<output>12/25 = around 0.48</output>

<result>12/25 = around 0.48</result>