There are five numbers, and their average is 138. Arrange these numbers in ascending order, then the average of the first three numbers is 127, and the average of the last three numbers is 148. What is the middle number? ．
有五个数，它们的平均数是138，把这些数按从小到大的顺序排列起来，那么前三个数的平均数是127，后三个数的平均数是148，中间那个数是多少．
<gadget id="calculator">127 * 3</gadget>
<output>381</output>

<gadget id="calculator">148 * 3</gadget>
<output>444</output>

<gadget id="calculator">381 + 444</gadget>
<output>825</output>

<gadget id="calculator">138 * 5</gadget>
<output>690</output>

<gadget id="calculator">825 - 690</gadget>
<output>135</output>

<result>135</result>