There are three non-zero natural numbers that are not equal to each other, and their average is 10. To make one of them as large as possible, what is the number?
有三个互不相等的非零自然数，它们的平均数为10，要使其中一个数尽可能大，这个数是多少．
<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<gadget id="calculator">30 - 1 - 2</gadget>
<output>27</output>

<result>27</result>