□, △ represent two numbers, and □-△=10, ((□)/(△))=((□-△)/(□-△-2)), then □=how much.
□，△代表两个数，并且□-△=10，((□)/(△))=((□-△)/(□-△-2))，那么□=多少．
<gadget id="calculator">40 + 10</gadget>
<output>50</output>

<result>50</result>