The ratio of people in workshop A and B is 3:5. If 10 people are transferred from workshop B to workshop A, the ratio of people in workshop A and B is now 2:3. How many people were there in workshop A?
甲乙两车间人数比是3：5，若从乙车间调10人到甲车间，现在甲乙车间的人数比是2：3，原来甲车间有多少人？
<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<result>30</result>