The average of 5 numbers is 20, and the average of the first 3 numbers is 16, what is the average of the last two numbers?
5个数的平均数是20，已知前3个数的平均数是16，那么后两个数的平均数是多少．
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">16 * 3</gadget>
<output>48</output>

<gadget id="calculator">100 - 48</gadget>
<output>52</output>

<gadget id="calculator">52 / 2</gadget>
<output>26</output>

<result>26</result>