The sum of the numerator and the denominator of a fraction is 56. After dividing it, we get (1/3). What is the original fraction?
一个分数的分子与分母的和是56，约分后得(1/3)，原来这个分数是多少．
<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">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">56 * (3/4)</gadget>
<output>42</output>

<gadget id="calculator">(1/4) / 42</gadget>
<output>1/168 = around 0.005952</output>

<gadget id="calculator">56 * (1/168)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>