If r ≤ s ≤ t ≤ u ≤ v ≤ 110 and the average, (arithmetic

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If r ≤ s ≤ t ≤ u ≤ v ≤ 110 and the average, (arithmetic mean) of r, s, t, u, and v is 100, what is the least possible value of r ?

答案：D

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