The heights of the two cylinders are equal, the ratio of the area of the bottom is 2:5, the volume of the larger cylinder is 400cm**2, what is the height of the smaller cylinder?
两个圆柱的高相等，底面积的比是2：5，较大圆柱的体积是400cm**2，较小圆柱的高是多少？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">400 * (2/5)</gadget>
<output>160</output>

<result>160</result>