A factory has three workshops, the number of people in the first workshop accounts for 20% of the total number of workers in the three workshops, and the number of people in the second workshop is (2/3) that of the third workshop. It is known that the first workshop has 30 fewer people than the second workshop, how many people are there in the three workshops?
某工厂有三个车间，第一车间的人数占三个车间总人数的20%，第二车间的人数是第三车间的(2/3)．已知第一车间比第二车间少30人，三个车间一共有多少人？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">75 * (1/5)</gadget>
<output>15</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">(7/2) * (1/5)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">15 / (3/10) / (1/5)</gadget>
<output>250</output>

<result>250</result>