Divide the 40 cards according to the number of cards in each group, and get the most groups.
把40张牌按照每组多少张一组的分法，得到的组数最多．
<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<result>4</result>