If r, s, and w are positive numbers such that w = 60r + 80s and r + s = 1, is w < 70? (1) r > 0.5 (2) r > s_出国考试答疑器_GMAT_试题

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题目：

If r, s, and w are positive numbers such that w = 60r + 80s and r + s = 1, is w < 70?

(1) r > 0.5

(2) r > s

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答案:

D

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