During the school-wide cleaning activity on Friday, there were (2/5) students in the sixth grade of Yucai Primary School sweeping the floor, and 35 students were cleaning the glass. The ratio of the remaining students to the total number of students in the sixth grade was 1:4. How many students are there in the sixth grade?
在周五的全校清洁大扫除活动中，育才小学六年级有(2/5)的同学在扫地，有35人在擦玻璃，剩下的人数和六年级总人数的比是1：4．六年级共有学生多少人？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">35 / (7/20)</gadget>
<output>100</output>

<result>100</result>