If the ratio of male teachers to female teachers in a school is 3:5, and there are 18 fewer male teachers than female teachers, how many teachers are there in the school?
某校男教师与女教师人数的比是3：5，男教师比女老师少18人，该校共有教师多少人．
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">9 * 8</gadget>
<output>72</output>

<result>72</result>