If a box of cakes is eaten (1/4) and there are still 12 pieces left, then how many pieces of cakes are there in this box?
如果一盒蛋糕吃掉了(1/4)后还剩12块，那么这盒蛋糕原来有多少块．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">12 / (3/4)</gadget>
<output>16</output>

<result>16</result>