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Five years ago the average age of A ,...

Five years ago the average age of `A ,\ B ,\ C ,\ D` was 45 years. By including X the present average of all the five is 49 years. Then the present age of X is (a) 40 years (b) 45 years (c) 48 years (d) 64 years

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RS AGGARWAL-AVERAGE-All Questions
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