The sum of the numerator and denominator of a simplest fraction is 25. If 10 is added to both the numerator and the denominator, the resulting new fraction can be reduced to (2/3), so what is the original simplest fraction?
一个最简分数的分子和分母的和是25，如果分子与分母都加上10后，所得到的新分数可化简成为(2/3)，那么原来的最简分数是多少？
<gadget id="calculator">25 + 10 + 10</gadget>
<output>45</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">45 * (2/5)</gadget>
<output>18</output>

<gadget id="calculator">18 - 10</gadget>
<output>8</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">45 * (3/5)</gadget>
<output>27</output>

<gadget id="calculator">27 - 10</gadget>
<output>17</output>

<gadget id="calculator">8 / 17</gadget>
<output>8/17 = around 0.470588</output>

<result>8/17 = around 0.470588</result>