After adding (1/4) to 20 meters, then reducing (1/4), what is the result in meters
20米增加它的(1/4)后，再减小(1/4)，结果是多少米
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

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

<gadget id="calculator">20 * (5/4) * (3/4)</gadget>
<output>75/4 = around 18.75</output>

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