Write a fraction that is greater than (2/7) and smaller than (3/7) and whose denominator does not exceed 30: how much.
写出一个比(2/7)大，且比(3/7)小，且分母不超过30的分数：多少．
<gadget id="calculator">5 / 14</gadget>
<output>5/14 = around 0.357143</output>

<result>5/14 = around 0.357143</result>