Solution ratio: (1/3): (1/2)=X: (1/40).
解比例：(1/3)：(1/2)=X：(1/40)．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/3) * (1/40)</gadget>
<output>1/120 = around 0.008333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/120) / (1/2)</gadget>
<output>1/60 = around 0.016667</output>

<result>1/60 = around 0.016667</result>