Solution ratio: x: 9 = (2/3): (5/6).
解比例：x：9=(2/3)：(5/6)．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * 9</gadget>
<output>6</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">6 / (5/6)</gadget>
<output>36/5 = around 7.2</output>

<result>36/5 = around 7.2</result>