A fraction whose numerator is 4 and whose denominator is twice the numerator, what is the fraction.
一个分数，它的分子是4，分母是分子的2倍，这个分数是多少．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>