The average age of A, B, C, ,D five years ago was 45 years .by including X, the present average age of all the five is 49years . what is the present age of X ?
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present average age of A,B,C,D is 50
the total of age is 50×4=200
the total of age of A,B,C,D,X is 49×5=245
Age of X is 245-200 =45
am I right?
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