Mathematics
Medium
Question
The average mark of the students of a class in a particular exam is 80. If 5 students whose average mark in that exam is 40 are excluded, the average mark of the remaining will be 90. Find the number of students who wrote the exam.
A
20
B
15
C
25
✓ Official correct answer
D
35
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A
20
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B
15
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C
25
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D
35
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