A fraction is divided into (7/9), and the sum of the numerator and denominator of the original fraction is 48. What is the original fraction?
一个分数约分以后是(7/9)，已知原分数的分子和分母之和为48，原分数是多少．
<gadget id="calculator">7 + 9</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">48 * (9/16)</gadget>
<output>27</output>

<gadget id="calculator">(7/16) / 27</gadget>
<output>7/432 = around 0.016204</output>

<gadget id="calculator">48 * (7/432)</gadget>
<output>7/9 = around 0.777778</output>

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