Walk a 54-kilometer road, walk 40% of the total length on the first day, walk the remaining half on the second day, how many kilometers did you walk on the second day?
走一条54千米的路，第一天走了全长的40%，第二天走了余下的一半，第二天走了多少千米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">54 * (3/5) * (1/2)</gadget>
<output>81/5 = around 16.2</output>

<result>81/5 = around 16.2</result>