A bag of flour, use up all (1/5) for the first time, use up all (1/4) for the second time, and share 27 kg for the two times, how many kg does this bag of flour weigh?
一袋面粉，第一次用去全部的(1/5)，第二次用去全部的(1/4)，两次共用27千克，这袋面粉重多少千克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/5) + (1/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">27 / (9/20)</gadget>
<output>60</output>

<result>60</result>