If x and y are points on the number line, what is the value of x + y ?
(1) 6 is halfway between x and y.
(2) y = 2x
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
6在XY的中间,说明6到x,6到Y的距离相等,可以知道y-6=6-x 可以得出x+Y=12。 这个等式代表无论x和Y取什么值,只要6是他们的midpoint,x+y都等于12. X可以等于3,Y可以等于9。X也可以等于5,Y等于7.但是无论怎么样,相加都等于12.(2)的话,我可以随意举两个例子,x=1,x=2的情况,x+y都不相等,所以不充分。
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