The number of students in the fifth grade of the experimental primary school is between 100-200, of which (2/7) participated in the reading group, and (4/13) participated in the mathematics interest group. How many people participated in the mathematics interest group?
实验小学五年级人数在100-200人之间，其中(2/7)的人数参加了阅读小组，有(4/13)的人数参加数学兴趣小组．参加数学兴趣小组的有多少人．
<gadget id="calculator">7 * 13</gadget>
<output>91</output>

<gadget id="calculator">91 * 2</gadget>
<output>182</output>

<gadget id="calculator">4 / 13</gadget>
<output>4/13 = around 0.307692</output>

<gadget id="calculator">182 * (4/13)</gadget>
<output>56</output>

<result>56</result>