The height of a parallelogram is 15 decimeters, and the base is 1/3 less than the height. What is the area of the parallelogram in square decimeters?
一个平行四边形的高是15分米，底比高少(1/3)，这个平行四边形的面积是多少平方分米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">15 * (1/3)</gadget>
<output>5</output>

<gadget id="calculator">15 - 5</gadget>
<output>10</output>

<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<result>150</result>