Zheng He’s fleet was on the way to the west, a ship accidentally hit a hidden reef and started to seep water. If 25 people are arranged for 50 minutes, the water can be drained dry, and if 15 people are arranged for 100 minutes, the water can be drained dry. Due to the emergency, we must If the water is scooped up within 20 minutes, then at least how many people should be arranged.
郑和的船队在下西洋的途中，一艘船不慎撞上暗礁开始渗水，如果安排25人50分钟可以将水舀干，如果安排15个人100分钟可以将水舀干，由于情况紧急，必须在20分钟内将水舀干，那么至少要安排多少人．
<gadget id="calculator">15 * 100</gadget>
<output>1_500</output>

<gadget id="calculator">25 * 50</gadget>
<output>1_250</output>

<gadget id="calculator">1_500 - 1_250</gadget>
<output>250</output>

<gadget id="calculator">100 - 50</gadget>
<output>50</output>

<gadget id="calculator">250 / 50</gadget>
<output>5</output>

<gadget id="calculator">5 * 100</gadget>
<output>500</output>

<gadget id="calculator">1_500 - 500</gadget>
<output>1_000</output>

<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">1_000 + 100</gadget>
<output>1_100</output>

<gadget id="calculator">1_100 / 20</gadget>
<output>55</output>

<result>55</result>