If ○/(2/5)=(1/2), □/(2/3)=(9/20), then ○/□=how much.
如果○/(2/5)=(1/2)，□/(2/3)=(9/20)，那么○/□=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

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

<gadget id="calculator">(9/20) * (2/3)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(2/5) / (3/10)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(1/2) * (4/3)</gadget>
<output>2/3 = around 0.666667</output>

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