THE CORRECT ANSWER IS (B). BY DEFINITION, 5(X1Y) IS DIVISIBLE BY 5...

14. The correct answer is (B). By definition, 5(x

1

y) is divisible by 5, but you also need

to know whether z is divisible by 5. Statement (1) provides no additional information.

However, statement (2) alone is sufficient to answer the question. A quantity that is

divisible by 5 added to another quantity, z, divisible by 5 results in a sum that is

divisible by 5. (If x and y both equal 0, then 5(x

1

y)

1

z

5

z.)