If x can be proportional to the three numbers 2, 3, and 4, then x = how much.
如果x能与2、3、4这三个数组成比例，那么x=多少．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<result>6</result>