Two cylindrical containers, A and B, have a bottom area ratio of 4:3. The water depth in container A is 7 cm, and the water depth in container B is 3 cm. Now pour the same amount of water into the two containers until the water depth is the same. At this time, how deep is the water in the two containers A and B?
甲、乙两个圆柱形容器，底面积比是4：3，甲容器中水深7厘米，乙容器中水深3厘米，现在往两个容器中注入同样多的水，直到水的深度一样为止，这时甲、乙两个容器中的水深多少厘米？
<gadget id="calculator">7 - 3</gadget>
<output>4</output>

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

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

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">12 + 7</gadget>
<output>19</output>

<result>19</result>