Use a tractor to plow a piece of land, plowing this piece of land on the first day (1/5), plowing this piece of land more than the first day (1/10) on the second day, and plowing this piece of land in two days What percentage?
用拖拉机耕一块地，第一天耕了这块地的(1/5)，第二天比第一天多耕了这块地的(1/10)，两天共耕了这块地的几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/5) + (1/10) + (1/5)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>