A parallelogram and a rectangle have the same area. It is known that the length of the rectangle is 18 cm, the width is 10 cm, and the base of the parallelogram is 15 cm. What is its height in cm?
一个平行四边形和一个长方形的面积相等，已知长方形的长是18厘米，宽是10厘米，平行四边形的底是15厘米，那么它的高是多少厘米．
<gadget id="calculator">10 / 15</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">18 * (2/3)</gadget>
<output>12</output>

<result>12</result>