The volume of a container is 120 cubic centimeters. It is installed with three water pipes A, B, and C. A and B are water inlet pipes. The B water pipe enters 4 cubic centimeters of water per second. The C water pipe is a drain pipe that can discharge 8 cubic centimeters per second. centimeter. The container was empty at the beginning, and the three water pipes were opened, and the container was filled with water after a while. Then turn off the tube A, and the container will be empty after a while. From the beginning to the emptying of the water in the container, it took a total of 50 seconds. Ask how many cubic centimeters of water per second into the pipe A?
一个容器的容积是120立方厘米，它安装着甲、乙、丙三根水管，甲、乙都是进水管，乙水管每秒进水4立方厘米，丙水管是排水管，每秒能排水8立方厘米．开始容器时空的，把三根水管都打开，一会水就注满容器．再把甲管关掉，过不了多久容器就空了，从开始到容器里的水排空，总共用了50秒．问甲管每秒的进水量是多少立方厘米？
<gadget id="calculator">120 * 8</gadget>
<output>960</output>

<gadget id="calculator">120 * 4</gadget>
<output>480</output>

<gadget id="calculator">50 * 4 * 4</gadget>
<output>800</output>

<gadget id="calculator">50 * 8 * 8</gadget>
<output>3_200</output>

<gadget id="calculator">50 * 4 * 8</gadget>
<output>1_600</output>

<gadget id="calculator">50 * 8 * 4</gadget>
<output>1_600</output>

<gadget id="calculator">3_200 - 480 - 960 - 1_600 - 1_600</gadget>
<output>-1_440</output>

<gadget id="calculator">960 + 480 + 800 + (-1_440)</gadget>
<output>800</output>

<gadget id="calculator">50 * 8</gadget>
<output>400</output>

<gadget id="calculator">50 * 4</gadget>
<output>200</output>

<gadget id="calculator">400 - 120 - 200</gadget>
<output>80</output>

<gadget id="calculator">800 / 80</gadget>
<output>10</output>

<result>10</result>