There are 49 teachers in an experimental primary school, of which male teachers account for 2/7 of the total number of teachers. How many female teachers are there?
某实验小学共有教师49人，其中男教师人数占教师总人数的(2/7)，女教师有多少人？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">49 * (5/7)</gadget>
<output>35</output>

<result>35</result>