Solution ratio. ((3.2)/(1.5))=((X)/12).
解比例．((3.2)/(1.5))=((X)/12)．
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/12) * 1.5</gadget>
<output>0.125</output>

<gadget id="calculator">3.2 / 0.125</gadget>
<output>25.6</output>

<result>25.6</result>