The average of five numbers is 2002. After one of the numbers is rewritten as 2010, the average becomes 2010. What is the changed number?
五个数的平均数为2002，将其中一个数改写成2010后，其平均数也变为2010，则被改的数原来是多少．
<gadget id="calculator">2_010 - 2_002</gadget>
<output>8</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">2_010 - 40</gadget>
<output>1_970</output>

<result>1_970</result>