Dig a reservoir, if the length is 10 meters and the width is 2.5 meters, how many meters should be dug to store 50 cubic meters of water?
挖一个蓄水池，如果长是10米，宽是2.5米，要想蓄水50立方米，应挖多少米深．
<gadget id="calculator">10 * 2.5</gadget>
<output>25</output>

<gadget id="calculator">50 / 25</gadget>
<output>2</output>

<result>2</result>