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a merchant buys 2 quantities of rice at Rs60 and Rs40 per kg respectively .He pays a total of Rs 1000.On the other hand he paid a flat rate of Rs 500 per kg.He would have paid 10% more.How many kg of each type of rice did he buy?

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    Let x = rice at Rs60, and y = rice at Rs40. Assuming you have a typo, and meant Rs50/kg, we have

    60x + 40y = 1000
    50(x+y) = 1050

    x=8, y=13

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