The ratio of the number of people in the first, second and third workshops of the toy factory is 12:8:20, and the first workshop has 20 more people than the second workshop. How many people are there in the three workshops?
玩具厂一、二、三车间人数的比为12：8：20，一车间比二车间多20人．三个车间共有多少人？
<gadget id="calculator">12 / 40</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">8 / 40</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/10) - (1/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">20 / (1/10)</gadget>
<output>200</output>

<result>200</result>