Instructions

In the following questions numbered 1 to 20, a question is followed by data in the form of two statements labelled as I and II You have to decide whether the data given in the statement is sufficient to answer the questions.

Question 14

Is $$x = 0$$?
I.The arithmetic mean of x, y, z, t is 6.
II.The arithmetic mean of x, y, z, t is 8.


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