(2/7) of a number is the smallest composite number, what is this number?
一个数的(2/7)是最小的合数，这个数是多少．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">4 / (2/7)</gadget>
<output>14</output>

<result>14</result>