Divide a fraction, first use 5 to make an appointment, then use 3 to make an appointment twice, and get (1/2). What is the original score?
把一个分数约分，先用5约了一次，再用3约了两次，得(1/2)．原来这个分数是多少？
<gadget id="calculator">2 * 3 * 3 * 5</gadget>
<output>90</output>

<gadget id="calculator">5 / 90</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">1 * 3 * 3 * (1/18)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>