It has been 38 days to build a road with a length of 320 meters. A meter is repaired every day. How many meters are left to be repaired?
修一段长320米的公路，已经修了38天，每天修a米，还剩多少米没修．
<gadget id="calculator">320 - 38</gadget>
<output>282</output>

<result>282</result>