A and B are two cylindrical containers, the ratio of the bottom area is 5:4, the water depth of A container is 12 cm, and the water depth of B container is 8 cm. Then pour the same amount of water into the two containers until the water depth is equal, so how many centimeters should the water level of the second container rise?
甲、乙两个圆柱形容器，底面积之比是5：4，甲容器水深12厘米，乙容器水深8厘米．再往两个容器注入同样多的水，直到水深相等，这样乙容器的水面应上升多少厘米？
<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">60 - 32</gadget>
<output>28</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">28 / 1</gadget>
<output>28</output>

<gadget id="calculator">28 - 8</gadget>
<output>20</output>

<result>20</result>