20 small white rabbits, 15 small gray rabbits, 5 small rabbits in each cage, how many cages are needed
小白兔20只，小灰兔15只，每个笼子住5只小兔子，需要笼子多少个
<gadget id="calculator">20 + 15</gadget>
<output>35</output>

<gadget id="calculator">35 / 5</gadget>
<output>7</output>

<result>7</result>