The sum of the numerator and denominator of a fraction is 18. If you add 8 to the numerator and 9 to the denominator, the new fraction will be (3/4), what is the original fraction?
一个分数的分子和分母的和是18，如果将分子加上8，分母加上9，新分数约分后是(3/4)，原分数是多少？
<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<gadget id="calculator">20 - 9</gadget>
<output>11</output>

<gadget id="calculator">7 / 11</gadget>
<output>7/11 = around 0.636364</output>

<result>7/11 = around 0.636364</result>