1. The arithmetic mean (average) of 3, 5, 7, and y is 100. What is the value of y?
a. 85
b. 385
c. 95
d. 115
e. 105
2. What is z if 2.5% of z equals 75% of 50?
a. 75
b. 50
c. 25
d. 10
e. 1500
3. If x + y - z = 5 and x - y + z = 10, which of the following statements must be true?
I. y>z
II. x>5
III. y>5
a. I and II only
b. II only
c. II and III only
d. III only
e. I only
4. A small square region inside a larger square is shaded. The diagonal of the larger square is three times the diagonal of the small square in length. What fraction of the area of the larger square is not shaded?
a. 2/3
b. 1/3
c. 1/9
d. cannot be determined
e. 8/9