To build a swimming pool, it is necessary to dig a pit 50 meters long, 20 meters wide, and 1.5 meters deep. The excavator can dig 25 cubic meters of soil per hour. If it works 8 hours a day, how many days can it be finished?
建一个游泳池，要挖一个长50米，宽20米，深1.5米的坑．挖土机每小时可挖土25立方米，如果每天工作8小时，多少天可以挖完？
<gadget id="calculator">25 * 8</gadget>
<output>200</output>

<gadget id="calculator">1.5 / 200</gadget>
<output>0.0075</output>

<gadget id="calculator">50 * 20 * 0.0075</gadget>
<output>7.5</output>

<result>7.5</result>