A cuboid water tank has a length of 50 cm and a width of 4.5 decimeters measured from the inside. If 90 liters of water is filled, how high is the water in the tank?
一个长方体水箱，从里面量底面长为50厘米，宽为4.5分米，如果注水90升，水箱里的水有多高？
<gadget id="calculator">50 / 10</gadget>
<output>5</output>

<gadget id="calculator">5 * 4.5</gadget>
<output>22.5</output>

<gadget id="calculator">90 / 22.5</gadget>
<output>4</output>

<result>4</result>