Use a cylindrical container to hold water, the height of the water is 30cm, pour all the water into a conical container with the same bottom, what is the height of the water in cm?
用一个圆柱形容器盛水，水高30cm，将水全部倒入和它等底的圆锥形容器中，水的高度是多少cm？
<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<result>90</result>