The average of the three numbers is 6, and the ratio of the three numbers is (1/2):(2/3):(2/9). What is the largest number among these three numbers?
三个数的平均数是6，三数的比是(1/2)：(2/3)：(2/9)，这三个数中最大的数是多少．
<gadget id="calculator">9 + 12 + 4</gadget>
<output>25</output>

<gadget id="calculator">12 / 25</gadget>
<output>12/25 = around 0.48</output>

<gadget id="calculator">6 * 3 * (12/25)</gadget>
<output>216/25 = around 8.64</output>

<result>216/25 = around 8.64</result>