For a simple fraction, the numerator is multiplied by 3, and the denominator is divided by 4. The result is (21/4). What is the simplest fraction?
一个最简分数，分子乘3，分母除以4，结果是(21/4)，这个最简分数是多少．
<gadget id="calculator">21 / 3</gadget>
<output>7</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">7 / 16</gadget>
<output>7/16 = around 0.4375</output>

<result>7/16 = around 0.4375</result>