Dig a cuboid pool whose length and width are both 7 meters. If the volume of the pool is 98m**3, how many meters should be dug deep?
挖一个长和宽都是7米的长方体水池，要是水池的容积是98m**3，应该挖多少m深．
<gadget id="calculator">7 * 7</gadget>
<output>49</output>

<gadget id="calculator">98 / 49</gadget>
<output>2</output>

<result>2</result>