The ratio of the bottom areas of two rectangular containers A and B is 4:3. The water surface of container A is 4cm higher than that of container B, and then the same amount of water is poured into the two containers, and the depth of water in both containers is exactly 25cm. What is the depth of water in container A?
甲、乙两个长方形容器的底面积之比为4：3．甲容器水面比乙容器水面高4cm，再往两个容器中注入同样多的水，恰好容器中的水深都是25cm．原来甲容器中的水深多少厘米？
<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">25 - 12</gadget>
<output>13</output>

<result>13</result>