Calculation: ((1/4)+(1/5))/(1/20).
计算：((1/4)+(1/5))/(1/20)．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(9/20) / (1/20)</gadget>
<output>9</output>

<result>9</result>