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Sum of present ages of A and B is 81. Ag...

Sum of present ages of A and B is 81. Age of A 2 year hence is equal to age of C, 1 year ago. Ageof A, 4 year hence is equal to age of B, 1 year ago and ratio of present age of A and D is `2:3`. Find the difference of age of B and D.

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