There are four numbers whose average is 8. If one of the numbers 3 is changed to 12, what is the average of them?
有四个数，它们的平均数是8．把其中一个数3改为12，那么它们的平均数变成了多少．
<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">32 - 3</gadget>
<output>29</output>

<gadget id="calculator">29 + 12</gadget>
<output>41</output>

<gadget id="calculator">41 / 4</gadget>
<output>41/4 = around 10.25</output>

<result>41/4 = around 10.25</result>