Divide a fraction once with 5, and divide it twice with 2 to get (3/5). What is the original fraction?
将一个分数用5约分一次，用2约分两次，得(3/5)，这个分数原来是多少？
<gadget id="calculator">5 * 2 * 2 * 5</gadget>
<output>100</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">3 * 2 * 2 * (1/20)</gadget>
<output>3/5 = around 0.6</output>

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