A cuboid iron water tank is 18 decimeters long and 10 decimeters wide. It is known that this water tank can hold up to 1620 liters of water. How deep is this water tank?
一个长方体铁皮水箱，长18分米，宽10分米，已知这个水箱最多可装水1620升，这个水箱有多深？
<gadget id="calculator">18 * 10</gadget>
<output>180</output>

<gadget id="calculator">1_620 / 180</gadget>
<output>9</output>

<result>9</result>