A student obtained 20% of marks and failed by 50 marks from passing marks another student obtained 40% marks and get 30 marks more than the passing marks Find the total marks in exam:

A student obtained 20% of marks and failed by 50 marks from passing marks another student obtained 40% marks and get 30 marks more than the passing marks Find the total marks in exam:
400
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450
420
None of the above