A cup of pure milk is 320g. Xiaolan drank (1/4) for the first time, and then drank (1/4) after filling up with water. When did Xiaolan drink more pure milk? How many grams of pure milk did she drink the second time?
一杯纯牛奶320g，小兰第一次喝了(1/4)，加满水后又喝了(1/4)，小兰哪次喝的纯牛奶多？她第二次喝了多少克纯牛奶？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">320 * (1/4)</gadget>
<output>80</output>

<gadget id="calculator">320 - 80</gadget>
<output>240</output>

<gadget id="calculator">240 * (1/4)</gadget>
<output>60</output>

<result>60</result>