The denominator of a fraction is 13 greater than the numerator. After the numerator is increased by 3, a new fraction is obtained. Converting this fraction into the simplest fraction is (1/3). What is the original fraction?
一个分数的分母比分子大13，分子增加3以后，得到一个新的分数，把这个分数化成最简分数是(1/3)，原来的分数是多少？
<gadget id="calculator">13 - 3</gadget>
<output>10</output>

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

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">10 / (1/2)</gadget>
<output>20</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

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

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<result>2/15 = around 0.133333</result>