A road has been built for 15 kilometers, which is 5 kilometers less than the remaining two times. How many kilometers are left?
一条路已修了15千米，是剩下的2倍少5千米．剩下多少千米？
<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<result>10</result>