Known ((A)/12)=((B)/18)=((C)/15), then A: B= how much
已知((A)/12)=((B)/18)=((C)/15)，则A：B=多少
<gadget id="calculator">12 / 18</gadget>
<output>2/3 = around 0.666667</output>

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