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The mean age of a group of persons is 72 years and another group of persons is 63 years. If the mean age of all the persons of these two groups is 70, then the ratio of number of persons in the two groups is |
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Answer» The mean age of a group of persons is 72 years and another group of persons is 63 years. If the mean age of all the persons of these two groups is 70, then the ratio of number of persons in the two groups is |
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