The sum of the denominator and the numerator of a number is 216. After dividing it, we get (5/13). What is the fraction?
一个数的分母与分子的和是216，约分后得(5/13)，这个分数是多少．
<gadget id="calculator">13 + 5</gadget>
<output>18</output>

<gadget id="calculator">5 / 18</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">216 * (5/18)</gadget>
<output>60</output>

<gadget id="calculator">216 - 60</gadget>
<output>156</output>

<gadget id="calculator">(5/18) / 156</gadget>
<output>5/2_808 = around 0.001781</output>

<gadget id="calculator">216 * (5/2_808)</gadget>
<output>5/13 = around 0.384615</output>

<result>5/13 = around 0.384615</result>