20*(((1/4)-(1/10))*(1/3)).
20*(((1/4)-(1/10))*(1/3))．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/4) - (1/10)</gadget>
<output>3/20 = around 0.15</output>

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

<gadget id="calculator">(3/20) * (1/3)</gadget>
<output>1/20 = around 0.05</output>

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

<result>1</result>