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There are coins of one rupee and 50 pais...

There are coins of one rupee and 50 paisa in a box owned by elder brother of Mitali. The total value of the coins is Rs. 350. The sister of Mitali replaces `(1)/(3)` rd of the 50 paisa coins in the box by equal number of one rupee coins , so that the total value of the coins now becomes RS.400 . Determine the number of one rupee coins and 50 paisa coins each.

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