There are 45 more female teachers than male teachers in our school, and male teachers account for 4/13 of the female teachers. How many male teachers are there?
我们学校女教师比男教师多45人，男教师占女教师的(4/13)，男教师有多少人？
<gadget id="calculator">4 / 13</gadget>
<output>4/13 = around 0.307692</output>

<gadget id="calculator">1 - (4/13)</gadget>
<output>9/13 = around 0.692308</output>

<gadget id="calculator">45 / (9/13)</gadget>
<output>65</output>

<gadget id="calculator">65 - 45</gadget>
<output>20</output>

<result>20</result>