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[hline" certain "," 83.A person buys cer...

[hline" certain "," 83.A person buys certain number of marbles at "20" per "],[2.50" per "," rupee and an equal number at "30" per rupee.He "],[" he same "," mixes them and sells them at "25" per rupee.His gain "],[" w many "," or loss in the transaction is "]

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