There are two cylindrical containers A and B. Measure the perimeters of the bottom surfaces of containers A and B as 62.8cm and 31.4cm respectively. A and B respectively hold 4cm and 29cm deep water. Pour water into container A so that the two containers are the same depth, what is the depth of the water in cm?
有A、B两个圆柱形的容器，从里面量得A、B容器的底面周长分别为62.8cm、31.4cm，A、B内分别盛4cm和29cm深的水，先将B容器的一些水倒入A容器，使得两个容器水一样深，这时水深多少cm．
<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 4</gadget>
<output>1_256</output>

<gadget id="calculator">31.4 / 3.14 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">3.14 * 25 * 29</gadget>
<output>2_276.5</output>

<gadget id="calculator">1_256 + 2_276.5</gadget>
<output>3_532.5</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">3_532.5 / 392.5</gadget>
<output>9</output>

<result>9</result>