Discussion

Explanation:

Let his marks be 100, 90, 80, 70 and 60 in the five subjects. Hence, totally he has scored 400 marks. This constitutes only 60% of the total marks. Hence, total marks = 4000.6=667, Since the total marks in each subject is the same, hence maximum marks in each subject will be 6675 ≃ 133. Out of this 50% is the passing marks. In other words, to pass in a subject he needs to score 66.5 marks. We can see that only in 
one subject he scored less than this, viz. 60. Hence, he passed in 4 subjects.

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