There are five numbers whose average is 138. Arranged from small to large, the average of the first three numbers is 127, and the average of the last three is 148. What is the middle one?
有五个数，它们的平均数是138，从小到大排列，前三个数平均127，后三个平均148，中间一个是多少．
<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>