The ratio of the number of workers in factories A, B, and C is 3:4:5. The total number of workers in factories A and B is 700. How many workers are there in factory C?
甲、乙、丙三个厂工人的人数比是3：4：5，甲、乙两厂工人的总人数是700人，丙厂的工人有多少人？
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">3 + 4 + 5</gadget>
<output>12</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">700 / (7/12)</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 - 700</gadget>
<output>500</output>

<result>500</result>