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Question 13

Five years ago the average age of Aruna, Roy, David and salman is 45 years. Sita joins them now. The average age of all the five now is 49 years. The present age of sita is (in years)

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Five years ago the four had total age $$4\times45=180$$, so now their total age is $$180+4\times5=200$$. With Sita, the total age of all five now is $$5\times49=245$$, so Sita's present age is $$245-200=45$$.

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