The sum of the numerator and denominator of a fraction is 50. Add 3 to the numerator and subtract 3 to the denominator. The approximate fraction is (1/4). What is the original fraction?
一个分数的分子和分母的和是50，分子加上3，分母减去3，约分得(1/4)，原分数是多少．
<gadget id="calculator">50 - 3</gadget>
<output>47</output>

<gadget id="calculator">47 + 3</gadget>
<output>50</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">50 * (1/5)</gadget>
<output>10</output>

<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">50 * (4/5)</gadget>
<output>40</output>

<gadget id="calculator">40 + 3</gadget>
<output>43</output>

<gadget id="calculator">7 / 43</gadget>
<output>7/43 = around 0.162791</output>

<result>7/43 = around 0.162791</result>