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Answer

Correct Option is None of the above

Solution:
Let the full marks in biology be 100a
Marks obtained by X= 45a
Marks obtained by Y=50a
Marks obtained by Z=60a
ATQ
⇒45a+12.5=60a-4
⇒a=1.1
Individual marks of these four students can be easily obtained.
So, none of the statements is required

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