There is a natural number, the sum of it and 160 is equal to the square of a certain number, and the sum of it and 84 is equal to the square of another number, then, what is this natural number?
有一个自然数，它与160的和等于某一个数的平方，它与84的和又等于另一个数的平方，那么，这个自然数是多少．
<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">400 - 160</gadget>
<output>240</output>

<result>240</result>