The height of a parallelogram is 15 decimeters, and the base is 3 times the height. What is the area of this parallelogram?
一个平行四边形的高是15分米，底是高的3倍，这个平行四边形的面积是多少平方分米？
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<gadget id="calculator">45 * 15</gadget>
<output>675</output>

<result>675</result>