The number of teachers in schools A and B is equal. Due to work needs, 30 people are transferred from school A to school B. At this time, the number of teachers in school B is exactly three times the number of teachers in school A. How many teachers are there in School A and School B?
甲、乙两校教师的人数相等，由于工作需要，从甲校调30人到乙校去，这时乙校教师人数正好是甲校教师人数的3倍．求甲、乙两校原来各有教师多少人？
<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<gadget id="calculator">30 + 90</gadget>
<output>120</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<result>60</result>