Elite companies buy tickets for their employees to go to work. Purchased 123 in July and 145 in August. In August, I paid 264 yuan more than in July. In September, I paid 1,800 yuan for the monthly pass. How many monthly passes did I buy in September?
精英公司为职工乘车上班购买车票．七月份购买了123张，八月份购买了145张．八月份比七月份多付264元，九月份购买月票花了1800元，九月份购买了多少张月票？
<gadget id="calculator">145 - 123</gadget>
<output>22</output>

<gadget id="calculator">264 / 22</gadget>
<output>12</output>

<gadget id="calculator">1_800 / 12</gadget>
<output>150</output>

<result>150</result>