X: 10=(1/4):(1/3).
X：10=(1/4)：(1/3)．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 10</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(5/2) / (1/3)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>