24 



FARM ARITHMETIC. 



73. What is the percentage of nitrogen in a fertilizer 

 that contains 3 per cent of ammonia? 



Solution: 2 X -824 ==1.6. 

 Note. — Ammonia is 14/17 nitrogen, or, in decimals, 0.824. 



74. What is the percentage of nitrogen in a fertilizer 

 that analyzes 3 per cent ammonia? 



75. A fertilizer contains 2.5 pounds nitrogen in every 

 hundred. What is the percentage of ammonia ? 



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Manure Spreader at Work. 



When the spreader is used manure is applied evenly and uniformly. Then, too, 

 the cost of application is a minimum. 



76. In a ton of a certain fertilizer there are 40 pounds 

 of nitrogen. If this were to be expressed in ammonia, 

 how many pounds would there be? 



77. If another fertilizer contains 40 pounds of am- 

 monia, how many pounds of nitrogen would it contain? 



78. How many pounds of nitrogen in a ton of a fer- 

 tilizer that analyzes 3 per cent ammonia? 



