cuboid has a surface area of 420cm**2, a base area of 90cm**2, and a perimeter of the base of 40cm. What is the volume of the cuboid in cubic centimeters?
一个长方体的表面积是420cm**2，底面积是90cm**2，底面周长是40cm，这个长方体的体积是多少立方厘米？
<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<gadget id="calculator">420 - 180</gadget>
<output>240</output>

<gadget id="calculator">240 / 40</gadget>
<output>6</output>

<gadget id="calculator">90 * 6</gadget>
<output>540</output>

<result>540</result>