Dig a cuboid cistern with a length of 6 meters and a width of 5 meters, so that its volume is 90 cubic meters, how deep should the pool be dug?
挖一个长6米，宽5米的长方体蓄水池，要使它的容积是90立方米，这个水池应该挖多深？
<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">90 / 30</gadget>
<output>3</output>

<result>3</result>