A highway was repaired (2/5) on the first day and (1/8) on the second day, and ((())/(())) of the project was completed in two days.
一条公路，第一天修了(2/5)，第二天修了(1/8)，两天一共完成了这项工程的((())/(()))．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(2/5) + (1/8)</gadget>
<output>21/40 = around 0.525</output>

<result>21/40 = around 0.525</result>