Hi

Let x represent the 4% solutions, then (6-x) represents the 1% solution

.04x + .01(6-x) = .02*6qt

.03x = .01*6

x = 2 qt of 4% solution  0f butter fat milk

(6qt - 2qt) = 4qt 1% solution of butter fat milk

checking our answer

.04*2 + .01*4 = .08 + .04 = .12 

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