Buy movie tickets, 5 yuan, 8 yuan, 12 yuan, a total of 150 pieces, 1140 yuan is spent, of which the number of 5 yuan and 8 yuan tickets is equal, how many movie tickets are 5 yuan.
买电影票，5元、8元、12元一张的一共150张，用去1140元，其中5元和8元的张数相等，5元的电影票有多少．
<gadget id="calculator">150 * 12</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 - 1_140</gadget>
<output>660</output>

<gadget id="calculator">2 * 12</gadget>
<output>24</output>

<gadget id="calculator">24 - 5 - 8</gadget>
<output>11</output>

<gadget id="calculator">660 / 11</gadget>
<output>60</output>

<result>60</result>