An average score of a group of students is given.
If one of the student's score increases or decreases by a certain value, the average score changes accordingly.
Such questions are common in Paper 1 of P5 and P6 exams.
Calculator usage is not allowed.
After a Science Test, the average score of a group of students was 83.
Due to an error in marking, one of the students scored 68 instead of 88.
The new average of the group became 82 because of the adjustment.
How many students were there in the class?
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