The school bought 120 sets of desks and chairs at the same price for the first time, and 145 sets for the second time. The second time cost 2625 yuan more than the first time.
学校购买同样价格的桌椅，第一次买了120套，第二次买了145套，第二次比第一次多花了2625元，学校第一次买桌椅花了多少元？
<gadget id="calculator">145 - 120</gadget>
<output>25</output>

<gadget id="calculator">2_625 / 25</gadget>
<output>105</output>

<gadget id="calculator">105 * 120</gadget>
<output>12_600</output>

<result>12_600</result>