There are four classes in the third grade of a certain elementary school. There are 82 people in Class 1 and Class 2, and 118 people in Class 2, Class 3 and Class 4. It is also known that the number of students in the second class accounts for 25% of the whole grade. How many students are there in the third grade?
某小学三年级共有四个班．其中一班、二班共有82人，二班、三班和四班共有118人．又知二班学生人数占全年级的25%，求三年级共有学生多少人？
<gadget id="calculator">82 + 118</gadget>
<output>200</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">200 / (5/4)</gadget>
<output>160</output>

<result>160</result>