The difference between the denominator and the numerator of a fraction is equal to 12. After dividing, we get (3/5). Find the original fraction.
一个分数的分母与分子的差等于12，约分后得(3/5)，求原来的分数．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">3 / 30</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">6 * (1/10)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>