What is the average (arithmetic mean) of the numbers 15, 16, 17, 17, 18, and 19?
(A) 14.2
(B) 16.5
(C) 17
(D) 17.5
(E) 18

What is the greatest value of a positive integer n such that 3n is a factor of 1815?

a) 15
b) 18
c) 30
c) 33
d) 45

In a certain direct mail center, each of x computers addresses y letters every z minutes. If every computer works without interruption, how many hours are required for the center to address 100,000 letters?

(A) l00,000z/60xy

(B) 100,000x/60yz

(C) 100,000xy/60z

(D) 60xy/100,000z

(E) 60y/10,000xz

Point D is midpoint of AB and E is midpoint of AC. What is the ratio between the area of triangle DEF and triangle ABC.

A) 1:4

B) 1:9

C) 1:12

D) 4:9

E) can not be determined

Z=123^4-123^3+123^2-123, what is the remainder when Z is divided by 122.

A) 0
B) 1
C) 2
D) 3
E) 4

If the average size of 3 accounts is $1 million, is the smallest account less than $500,000?

1. The largest account is $1.3 million.
2. One of the accounts is $0.7 million.

A. Statement 1 alone is sufficient but statement 2 alone is not sufficient to answer the question asked.
B. Statement 2 alone is sufficient but statement 1 alone is not sufficient to answer the question asked.
C. Both statements 1 and 2 together are sufficient to answer the question but neither statement is sufficient alone.
D. Each statement alone is sufficient to answer the question.
E. Statements 1 and 2 are not sufficient to answer the question asked and additional data is needed to answer the statements.