A road has been repaired for 87.5 kilometers, and the rest is 21.5 kilometers less than the repaired one. How many kilometers is this road?
一条路已经修了87.5千米，剩下的比已修的少21.5千米，这条路长多少千米？
<gadget id="calculator">87.5 - 21.5</gadget>
<output>66</output>

<gadget id="calculator">87.5 + 66</gadget>
<output>153.5</output>

<result>153.5</result>