Two cylindrical containers, A and B, measure their radii from the inside to be 10 cm and 5 cm respectively. The two containers contain water of 10 cm and 15 cm respectively. Now pour the water in container B into container A , so that the water surfaces of the two containers are equal, how many centimeters is the water depth at this time?
甲、乙两个圆柱形容器，从里面量得它们的半径分别是10厘米和5厘米，两个容器内分别盛有10厘米和15厘米的水，现将乙容器中的水倒入甲容器内，使得两个容器的水面相平，这时水深为多少厘米？
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 10</gadget>
<output>3_140</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 15</gadget>
<output>1_177.5</output>

<gadget id="calculator">3_140 + 1_177.5</gadget>
<output>4_317.5</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">314 + 78.5</gadget>
<output>392.5</output>

<gadget id="calculator">4_317.5 / 392.5</gadget>
<output>11</output>

<result>11</result>