The road repair team plans to build a road 250 meters a day, and it takes 18 days to complete it. Now it is repairing an extra 50 meters a day. How many days will it take?
修路队修一条公路，计划每天修250米，18天完成，现在每天多修50米，需要几天完成？
<gadget id="calculator">250 + 50</gadget>
<output>300</output>

<gadget id="calculator">18 / 300</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">250 * (3/50)</gadget>
<output>15</output>

<result>15</result>