20 kilograms is less than how many kilograms (1/4).
20千克比多少千克少(1/4)．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">20 / (3/4)</gadget>
<output>80/3 = around 26.666667</output>

<result>80/3 = around 26.666667</result>