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Read the following question and decide w...

Read the following question and decide which of the given statements is are sufficient
Question: The average marks of X,Y,Z is 180. what is X's mark?
Statements: I :Y and Z together score 50 marks
II:X and Z together score 60 marks.

A

Both 1 and 2 are together are sufficient

B

either 1 or 2 is sufficient

C

1 alone is sufficient while 2 has alone is not sufficient

D

2 alone is sufficient while 1 alone is not sufficient

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