There are 5 numbers, the average of which is 138, arranged from small to large, the average of the first 3 numbers starting from the small end is 127, and the 3 numbers are taken sequentially from the big end, and the average is 148, then the third What is the number.
有5个数，其平均数为138，按从小到大排列，从小端开始前3个数的平均数为127，从大端开始顺次取出3个数，其平均数为148，则第三个数是多少．
<gadget id="calculator">127 * 3</gadget>
<output>381</output>

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

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

<gadget id="calculator">444 - 690</gadget>
<output>-246</output>

<gadget id="calculator">381 + (-246)</gadget>
<output>135</output>

<result>135</result>