There are two kinds of cylindrical measuring cups in the laboratory, the bottom areas are 10cm**2 and 15cm**2 respectively. A cup of water is poured into a measuring cup with a bottom area of 15cm**2 and it reaches the 8cm mark. If this cup of water is poured into a measuring cup with a bottom area of 10cm**2, what is the height of the water surface? (column ratio solution)
实验室有两种圆柱形量杯，底面积分别为10cm**2和15cm**2．有一杯水，倒入底面积为15cm**2的量杯后正好到8cm刻度线，如果把这杯水倒入底面积为10cm**2的量杯，水面高度是多少？(列比例解答)
<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<gadget id="calculator">120 / 10</gadget>
<output>12</output>

<result>12</result>