Asked by college
                store mixes a Brazilian coffee worth worth $10 per kilogram and a turkish coffee worth $13 per kilogram. The mixture is to sell for $12 per kilogram. Find out how much of each should be used to make a 420-kilogram mixture. 
my calculations all came out super wrong
            
        my calculations all came out super wrong
Answers
                    Answered by
            Steve
            
    If there are x kg of Brazilian coffee, then the rest (420-x) is Turkish. So,
10x + 13(420-x) = 12*420
x = 140
Note that 140 is 1/3 of 420, meaning that it drags the price down 1/3 of the way from 13 to 10, or $12.
    
10x + 13(420-x) = 12*420
x = 140
Note that 140 is 1/3 of 420, meaning that it drags the price down 1/3 of the way from 13 to 10, or $12.
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