Two teams, A and B, are going to build roads. Team A has completed the project (4/15), and team B has completed (2/5). How much is left to be completed?
甲乙两队去修路，甲队完成工程的(4/15)，乙队完成(2/5)，还剩多少没完成？
<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (4/15) - (2/5)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>