The sum of the numerator and denominator of a simplest fraction is 49. Add 4 to the numerator and subtract 4 from the denominator. The new fraction obtained is reduced to (4/3). Find the original fraction.
一个最简分数、分子分母之和为49，分子加4、分母减4，得到的新分数约简为(4/3)，求原来的分数多少．
<gadget id="calculator">28 - 4</gadget>
<output>24</output>

<gadget id="calculator">21 + 4</gadget>
<output>25</output>

<gadget id="calculator">24 / 25</gadget>
<output>24/25 = around 0.96</output>

<result>24/25 = around 0.96</result>