A cuboid water tank can hold 90 liters of water, its height is 5 decimeters, what is its bottom area in decimeters**2.
一个长方体水箱能盛水90升，它的高是5分米，它的底面积是多少分米**2．
<gadget id="calculator">90 / 5</gadget>
<output>18</output>

<result>18</result>