Question 184025
The Nature Center sells bird seed for 75 cents per pound and sunflower seed for $1.10 per pound. To the nearest pound, how many pounds of sunflower seed should be used to create a 50-pound mixture that sells for $0.90 per pound. 
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Equation:
value + value = value
75x + 110(50-x) = 90*50

75x + 110*50 - 110x = 90*50

-35x = -20*50
x = 28.57 lbs (amt. of 75 cent seed in the mixture)
50-28.57 = 21.43 lbs. (amt of $1.10 seed in the mixtue)

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Cheers,
Stan H.