The ratio of the numerator to the denominator of a fraction is 2:3. If the numerator is subtracted from 18 and the denominator from 22, the result is (3/5). What is the original fraction?
一个分数分子分母之比是2：3，如果这个分子减去18，分母减去22，约分后得(3/5)，这个分数原来是多少．
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">72 / 72</gadget>
<output>1</output>

<gadget id="calculator">(2/3) * 1</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>