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If 6w is an integer and 21/2 < 5w < 31/2, what is the value of w?____

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解析：
因为根据题干2/2 < 5w < 3/2，则5/2 < 5w < 7/2，5/10 < w <7/10，又因为6w是正数，所以w一定是1/6的倍数，所以w的值为4/6 = 0.666.
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