The paper mill needs to build a water storage tank for sewage treatment, and the planned water storage capacity should reach 150 tons. Now it has been determined that the length of the reservoir is 8 meters and the width is 7.5 meters, so how deep should the reservoir be dug at least? (1 ton per cubic meter of water)
造纸厂要建造一个处理污水的蓄水池，计划蓄水量要达到150吨．现在已经确定蓄水池的长是8米，宽是7.5米，那么这个蓄水池至少应挖多少米深？(每立方米水重1吨)
<gadget id="calculator">8 * 7.5</gadget>
<output>60</output>

<gadget id="calculator">150 / 1 / 60</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>