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题库 / Prep2007E1-DS-149
If m, r, x, and y are positive, is the ratio of m to r equal to the ratio of x to y ?
(1) The ratio of m to y is equal to the ratio of x to r.
(2) The ratio of m + x to r + y is equal to the ratio of x to y.
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.
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????? 不对吧。 R等于0怎么办
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