The sum of the numerator and denominator of a fraction is 25. If you add 8 to the numerator and 7 to the denominator, the new fraction will be (1/3) after division. What is the original fraction?
一个分数的分子和分母的和是25，如果将分子加上8，分母加上7，新的分数约分后是(1/3)，原来的分数是多少？
<gadget id="calculator">25 + 8 + 7</gadget>
<output>40</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">40 * (1/4)</gadget>
<output>10</output>

<gadget id="calculator">10 - 8</gadget>
<output>2</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">40 * (3/4)</gadget>
<output>30</output>

<gadget id="calculator">30 - 7</gadget>
<output>23</output>

<gadget id="calculator">2 / 23</gadget>
<output>2/23 = around 0.086957</output>

<result>2/23 = around 0.086957</result>