What is the 20% reduction in 25 kilometers?
25千米减少20%是多少千米．
<gadget id="calculator">25 / 100</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">25 * (3/4)</gadget>
<output>75/4 = around 18.75</output>

<result>75/4 = around 18.75</result>