There are 45 students in a certain class, all of whom participated in extracurricular interest groups. Those who participated in the sports group accounted for (2/5) of the total number of people, those who participated in the music group accounted for (1/3) of the total number of people, and the rest participated in the art group. What percentage of the total number of people participated in the art group?
某班有学生45人，全部参加了课外兴趣小组．参加体育组的占总人数的(2/5)，参加音乐组的占总人数的(1/3)，其余的参加了美术小组．参加美术小组的占总人数的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">1 - (2/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>