Among the five data, four of them are 2, 3, 5, 10 respectively, and the average of these five data is 8, then what is the fifth data.
五个数据中，其中四个数据分别为2，3，5，10，这五个数据的平均数为8，则第5个数据是多少．
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">2 + 3 + 5 + 10</gadget>
<output>20</output>

<gadget id="calculator">40 - 20</gadget>
<output>20</output>

<result>20</result>