单选题 What is the value of x/yz? (1) x = y/2 and z = 2x/5. (2) x/z=5/2 and 1/y=1/10.

A、 Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B、 Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C、 BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D、 EACH statement ALONE is sufficient.
E、 Statements (1) and (2) TOGETHER are NOT sufficient.

【正确答案】 B

【答案解析】(1) Given that x = y/2 and z = 2x/5, it follows that x/yz=

, which will have different values for different nonzero values of x; NOT sufficient.(2) Given that x/z = 5/2 and 1/y = 1/10, it follows that x/yz=