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</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * 18</gadget>
<output>12</output>

<result>12</result>