If the sum of the volumes of the cylinder and the cone with the same base and height is 28m**2, what is the volume of the cylinder in m**3?
等底等高的圆柱和圆锥的体积之和是28m**2，则圆柱的体积是多少m**3．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">28 / (4/3)</gadget>
<output>21</output>

<result>21</result>