The sum of the numerator and denominator of a fraction is 36, and the sum of the fraction is (4/5). What is the fraction?
一个分数的分子和分母和是36，约分后是(4/5)，这个分数是多少．
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">36 / 9</gadget>
<output>4</output>

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

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">16 / 20</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>