If the average (arithmetic mean) of the assessed values
of x houses is $212,000 and the average of the assessed values of y other houses is $194,000, what is the average of the assessed values of the x+y houses?
Average of (x+y) houses = (212,000*x + 194,000*y)/(x+y)
Stmt 1: Insufficient since x and y can have many possible values.
Stmt 2: Sufficient. Plugging in 2y for x we can find the average. I think it is safe to assume y cannot be 0, since the average of y houses is defined.
Hence, B for me.