The average of the four numbers is 60. If one of the numbers is changed to 60, the average of the four numbers becomes 66. What is the changed number?
四个数的平均数是60，若把其中一个数改为60，这四个数的平均数变为66，被改的数是多少？
<gadget id="calculator">66 * 4</gadget>
<output>264</output>

<gadget id="calculator">60 * 4</gadget>
<output>240</output>

<gadget id="calculator">264 - 240</gadget>
<output>24</output>

<gadget id="calculator">60 - 24</gadget>
<output>36</output>

<result>36</result>