There are two cylindrical containers A and B, the ratio of the bottom area is 4:1, the water depth of A container is 8 cm, and the water depth of B container is 5 cm, and then pour the same amount of water into the two containers until the water depth is equal, so that the water depth of B container How many centimeters should the water level rise?
甲、乙两个圆柱体容器，底面积之比为4：1，甲容器水深8厘米，乙容器水深5厘米，再往两个容器中注入同样多的水，直到水深相等，这样乙容器的水面应上升多少厘米？
<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">32 - 5</gadget>
<output>27</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">27 / 3</gadget>
<output>9</output>

<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<result>4</result>