gmat math

For a recent play performance, the ticket
prices were $25 per adult and $15 per child. 
A total of 500 tickets were sold for the performance.  How many of the tickets sold were for adults?

(1)    
Revenue from ticket sales for this performance totaled $10,500.

(2)     The
average (arithmetic mean) price per ticket sold was $21.

A. Statement (1) ALONE is
sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is
sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER
are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is
sufficient.

E. Statements (1) and (2) TOGETHER
are NOT sufficient.

Answer: