50% of a number is exactly the smallest composite number, what is this number?
一个数的50%正好是最小的合数，这个数是多少．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / (1/2)</gadget>
<output>8</output>

<result>8</result>