The area of a parallelogram is 60cm**2, if its height is reduced by 2 times and its base remains the same, what is the area in cm**2?
一个平行四边形的面积是60cm**2，如果它的高缩小2倍，底不变，面积是多少cm**2．
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<result>30</result>