There are six numbers, their average is 25, the average of the first three numbers is 21, and the average of the last four numbers is 32, then what is the third number?
有六个数，它们的平均数是25，前三个数的平均数是21，后四个数的平均数是32，那么第三个数是多少？
<gadget id="calculator">21 * 3</gadget>
<output>63</output>

<gadget id="calculator">32 * 4</gadget>
<output>128</output>

<gadget id="calculator">25 * 6</gadget>
<output>150</output>

<gadget id="calculator">128 - 150</gadget>
<output>-22</output>

<gadget id="calculator">63 + (-22)</gadget>
<output>41</output>

<result>41</result>