A triangle and a parallelogram have the same base and height. If the area of the parallelogram is 20 square centimeters larger than that of the triangle, what is the area of the parallelogram in square centimeters?
一个三角形和一个平行四边形等底等高，如果平行四边形比三角形的面积多20平方厘米，这个平行四边形的面积是多少平方厘米．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">20 / 1</gadget>
<output>20</output>

<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<result>40</result>