A road construction team repairs a 1,500-meter-long road, and repairs 45 meters a day for 18 days. How many meters of this road are left to be repaired?
一条筑路队修一条长1500米的公路，每天修45米，修了18天，这条路还有多少米没有修？
<gadget id="calculator">45 * 18</gadget>
<output>810</output>

<gadget id="calculator">1_500 - 810</gadget>
<output>690</output>

<result>690</result>