The sum of the numerator and denominator of a fraction is 64, and it is (7/9) after converted into the simplest fraction. What is the original fraction?
一个分数的分子和分母的和是64，化成最简分数后是(7/9)，原来这个分数是多少．
<gadget id="calculator">9 + 7</gadget>
<output>16</output>

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

<gadget id="calculator">9 / 16</gadget>
<output>9/16 = around 0.5625</output>

<gadget id="calculator">64 * (9/16)</gadget>
<output>36</output>

<gadget id="calculator">(7/16) / 36</gadget>
<output>7/576 = around 0.012153</output>

<gadget id="calculator">64 * (7/576)</gadget>
<output>7/9 = around 0.777778</output>

<result>7/9 = around 0.777778</result>