The road repair team built a 2,000-meter road, and repaired an average of 78 meters per day. After 15 days of repairing, how many meters are left to be repaired?
修路队修建一条2000米的公路，平均每天修78米，修了15天，还剩多少米没有修？
<gadget id="calculator">78 * 15</gadget>
<output>1_170</output>

<gadget id="calculator">2_000 - 1_170</gadget>
<output>830</output>

<result>830</result>