There are 80 eggs, and (2/5) of them sold is equivalent to how many eggs are sold, leaving ((())/(())).
有80个鸡蛋，卖去它的(2/5)相当于卖去多少个，还剩((())/(()))．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">80 * (2/5)</gadget>
<output>32</output>

<result>32</result>