Known: □/△=3...5, □+△=53, then □-△=how much.
已知：□/△=3…5，□+△=53，则□-△=多少．
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">36 + 5</gadget>
<output>41</output>

<result>41</result>