x and y are proportional, when x=2, y=(2/3), when x=0.3, y=what
x和y成正比例，当x=2时，y=(2/3)，当x=0.3时，y=多少
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * 0.3</gadget>
<output>0.2</output>

<gadget id="calculator">0.2 / 2</gadget>
<output>0.1</output>

<result>0.1</result>