According to 305+(40*(157-□))=585, how much should be filled in □.
根据305+(40*(157-□))=585，□里应填多少．
<gadget id="calculator">585 - 305</gadget>
<output>280</output>

<gadget id="calculator">280 / 40</gadget>
<output>7</output>

<gadget id="calculator">157 - 7</gadget>
<output>150</output>

<result>150</result>