Use 144 boxes to pack eggs, each box contains 504 eggs, if each box contains 648 eggs. In this way, how many boxes can be emptied?
用144只箱子装鸡蛋，每只箱子装504个，若每只箱子装648个．这样，可空出几只箱子？
<gadget id="calculator">144 / 648</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">504 * (2/9)</gadget>
<output>112</output>

<gadget id="calculator">144 - 112</gadget>
<output>32</output>

<result>32</result>