Algebra
posted by Chuck .
A store mixes Kenyan coffee worth $11 per kilogram and Turkish coffee worth $13 per kilogram. The mixture is to sell for $12 per kilogram. Find how much of each should be used to make a 348kilogram mixture. How many kilograms of the Kenyan coffee should be in the mixture?

11K + 13T = 12*348
but K+T=348, so
11K + 13(348K) = 12*348
K = 174
as expected, since the final price is the average of the two kinds, there is an equal amount of each.