The area of a parallelogram is 60cm**2, if its height is reduced by 3 times and its base remains unchanged, what is its area?
一个平行四边形的面积是60cm**2，如果它的高缩小3倍，底不变，面积是多少．
<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<result>20</result>