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A 10.0 lb bag of 20:10:5 fertilizer is 20.0% nitrogen by weight. 

a) Calculate how many grams of nitrogen are contained in the bag.  (I got 907 grams of Nitrogen) 

b) If the bag of fertilizer covers 8.6 x 10^4 ft^2, calculate the number of grams of nitrogen per square foot of coverage.  

 

 

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