There are three numbers, their ratio is 2:3:4, the average number is 42, what is the smallest number among them.
有三个数，它们的比是2：3：4，平均数是42，其中最小的数是多少．
<gadget id="calculator">2 + 3 + 4</gadget>
<output>9</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">42 * 3 * (2/9)</gadget>
<output>28</output>

<result>28</result>