There are two simplest proper fractions with the same denominator, their sum is (3/7), and the ratio of the two numerators is 4:5, what is the larger of the two fractions?
有两个分母相同的最简真分数，它们的和是(3/7)，两个分子的比是4：5，这两个分数中较大的一个是多少．
<gadget id="calculator">9 * 7</gadget>
<output>63</output>

<gadget id="calculator">63 / 3</gadget>
<output>21</output>

<gadget id="calculator">5 / 21</gadget>
<output>5/21 = around 0.238095</output>

<result>5/21 = around 0.238095</result>