If a:b=2:3, b:c=1:2, and a+b+c=66, then a=how much.
若a：b=2：3，b：c=1：2，且a+b+c=66，则a=多少．
<gadget id="calculator">2 + 3 + 6</gadget>
<output>11</output>

<gadget id="calculator">2 / 11</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">66 * (2/11)</gadget>
<output>12</output>

<result>12</result>