○+○+○+○=100; (△+△)*○=100; □+○*△*△=104, what is □
○+○+○+○=100；(△+△)*○=100；□+○*△*△=104，□是多少
<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<gadget id="calculator">100 / 25</gadget>
<output>4</output>

<result>4</result>