A fraction, the sum of numerator and denominator is 60, if adding 4 to the numerator and subtracting 4 from the denominator, it can be divided into (1/3), what is the fraction.
一个分数，分子与分母和为60，如果把分子加上4，分母减去4后，可约分为(1/3)，这个分数是多少．
<gadget id="calculator">60 - 4</gadget>
<output>56</output>

<gadget id="calculator">56 + 4</gadget>
<output>60</output>

<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">60 * (1/4)</gadget>
<output>15</output>

<gadget id="calculator">15 - 4</gadget>
<output>11</output>

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

<gadget id="calculator">60 * (3/4)</gadget>
<output>45</output>

<gadget id="calculator">45 + 4</gadget>
<output>49</output>

<gadget id="calculator">11 / 49</gadget>
<output>11/49 = around 0.22449</output>

<result>11/49 = around 0.22449</result>