The difference between the denominator and the numerator of a true fraction is 18. After the division, we get (5/8). What is the original fraction?
一个真分数的分母和分子的差为18，约分后得(5/8)，原分数是多少．
<gadget id="calculator">18 / 3</gadget>
<output>6</output>

<gadget id="calculator">6 * 8</gadget>
<output>48</output>

<gadget id="calculator">5 / 48</gadget>
<output>5/48 = around 0.104167</output>

<gadget id="calculator">6 * (5/48)</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>