There are 4 numbers, their average is 34, the average of the first 3 numbers is 30, and the average of the last two numbers is 36, what is the third number?
有4个数，他们的平均数是34，其中前3个数的平均数是30，后两个数的平均数是36，求第三个数是多少？
<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<gadget id="calculator">90 + 72</gadget>
<output>162</output>

<gadget id="calculator">34 * 4</gadget>
<output>136</output>

<gadget id="calculator">162 - 136</gadget>
<output>26</output>

<result>26</result>