It is known that the average of 12 numbers is 10. After changing one of them to half of it, the average of these 12 numbers becomes 8. Find the changed number.
已知12个数的平均数是10，将其中一个改成它的一半后，这12个数的平均数变成8，求被改变的数．
<gadget id="calculator">10 - 8</gadget>
<output>2</output>

<gadget id="calculator">2 * 12</gadget>
<output>24</output>

<gadget id="calculator">10 + 24</gadget>
<output>34</output>

<result>34</result>