how many kg of salt at 42paise per kg mixed with another 25kg of salt at 24 paise per kg so that on selling the mixture at 40 paise per kg to gain 25%
mixture alligation
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  • let x kg be the amount of salt... 
    cost price = 42x+24*25 
    selling price = 40(x+25) 
    profit = 25% 
    so 
    (SP - CP)/CP = 25% 

    => 40x + 1000 - 42x - 600 = .25 
    on solving we get 
    x = 20kg


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