There are 128 apples on the table, 4 are taken away each time, and 100 are left after how many times.
桌子上有128个苹果，每次拿走4个，拿多少次后还剩下100个．
<gadget id="calculator">128 - 100</gadget>
<output>28</output>

<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<result>7</result>