In Yucai Primary School, male teachers account for 1/3 of the total number of teachers. If 4 female teachers are transferred out and 4 male teachers are transferred in, the ratio of male to female teachers is 4:5. How many teachers are there in Yucai Primary School?
育才小学，男教师占全体教师总数的1/3，如果调出4个女教师，调进4个男教师，则男女教师人数之比是4：5，育才小学有教师多少人？
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(4/9) - (1/3)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">4 / (1/9)</gadget>
<output>36</output>

<result>36</result>