In the exam the average was found to be p mark. After deducting typographical error the average marks of 85 student reduced from 75 to 50 . Due to this the average came down by 25 marks. What was the number of students who took the exam? Pick one
A) 100	B) 85	C) 110	D) 130	E) 160
Explanation :   Number of student = (75-50) * 85/25= 
<gadget id="calculator">(75-50) * 85/25</gadget>
<output>85</output>
85   Answer : 85
<result>B</result>
In the exam the average was found to be p mark. After deducting typographical error the average marks of 85 student reduced from 75 to 50 . Due to this the average came down by 25 marks. What was the number of students who took the exam?