1. Is the average (arithmetic mean) of 5 different positive integers atleast 30?
a. Each of the integer is a multiple of 10
b. The sum of the integer is 160

2. IxI = Y - Z ?
a. X + Y = Z
b. X < 0

3. Warehouse Q's revenue from the sale of sofas was what percent greater this year than it was last year?
a. Warehouse W sold 10 percent more sofas this year than it did last year
b. Warehouse W's selling price per sofa was $30 greater this year than it was last year

4. Circle C and line k lie in the xy-plane. If circle C is centered at the origin and has radius 1, does line k intersect c?
a. The x intercept of line k is greater than 1
b. The slope of line k is -1/10

Statement 1: Let's assume following set of integers
1. {0, 10, 20, 30, 40} --> Average = 20
2. {10, 20, 30, 40, 50} --> Average = 30

Not sufficient

Statement 2: Sum of the integers = 160 and number of integers = 5
Hence, average = 160/5 = 32

Sufficient

The correct answer is B.

MO- A

stmnt 1 - ( sufficient) x+y=z
then x = z-y ( when x positive)
x= y-z ( when x negative)
stmnt2- ( insufficient)