The ratio of the numerator to the denominator of a fraction is 2:7. It is known that the numerator is 25 smaller than the denominator. What is the fraction?
一个分数的分子和分母的比是2：7，已知分子比分母小25，这个分数是多少．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(2/7) * 25</gadget>
<output>50/7 = around 7.142857</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(50/7) / (5/7)</gadget>
<output>10</output>

<gadget id="calculator">10 + 25</gadget>
<output>35</output>

<gadget id="calculator">(50/7) / (5/7) / 35</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>