what is average of $$x, y, z$$ and t ?
(I) The average of $$x$$ and t is and the average of y and z is also 5.
(II) $$x, y, z$$ and t are integers $$\geq 1$$.

A

if the statement I alone is sufficient to answer the question.

B

if the statement II alone is sufficient to answer the question.

C

if both the statements I and II are sufficient to answer the question but neither statement alone is sufficient

D

it both the statements I and II together are not sufficient to answer the question and additional data is required.