Two cylindrical containers, A and B, have a bottom area ratio of 4:3. The depth of water in container A is 7 cm, and the depth of water in container B is 3 cm. Then, the same amount of water is poured into the two containers until the water depth is equal. How deep is the water in centimeters.
甲乙两个圆柱体容器，底面积比是4：3，甲容器内水深7厘米，乙容器水深3厘米，再往两个容器内各注入同样多的水，直到水深相等．这时水深多少厘米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) * 3</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">7 - (9/4)</gadget>
<output>19/4 = around 4.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(19/4) / (1/4)</gadget>
<output>19</output>

<result>19</result>