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Let x = pounds of birdseed;  then the pounds of sunflowers is (50-x).
The money equation is
    0.62x + 0.92*(50-x) = 0.85*50.
From the equation, express x and calculate
    x = 
 = 11.667 pounds of birdseed.
ANSWER.  11.667 pounds of birdseed and the rest, (50-11.667) = 38.333 pounds of sunflower.
Solved.