Class 51 students are divided into three groups to carry out activities, the number of people participating in the sports group accounts for (1/4) of the whole class, the number of people participating in the science and technology group accounts for (2/5) of the whole class, and the rest of the students participate in the entertainment group ． What percentage of the whole class do the students participating in the entertainment group account for?
五1班同学分成三个小组开展活动，参加体育小组的人数占全班同学的(1/4)，参加科技小组的人数占全班同学的(2/5)，剩下的同学参加文娱小组．参加文娱小组的同学占全班同学的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<result>7/20 = around 0.35</result>