When Ma Xiaohu calculated 400-□/8, he did the subtraction first, and the result was 40. What is the correct result?
马小虎在计算400-□/8时，先算了减法，得到的结果是40，正确的结果是多少．
<gadget id="calculator">40 * 8</gadget>
<output>320</output>

<gadget id="calculator">400 - 320</gadget>
<output>80</output>

<gadget id="calculator">80 / 8</gadget>
<output>10</output>

<gadget id="calculator">400 - 10</gadget>
<output>390</output>

<result>390</result>