A highway was repaired (2/5) in the first week, and the rest (1/2) was repaired in the second week, and how much remained unrepaired.
一条公路，第一周修了(2/5)，第二周修了剩下的(1/2)，还剩多少没有修．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/5) - (3/10)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>