Question 1069007
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the ratio of the fertilizer was 5 parts nitrogen to ten parts all other ingredients. The farmer bought 135 pounds of fertilizer. 
How many pounds of nitrogen did he get?
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"5 parts nitrogen to ten parts all other ingredients" means that you have 15 parts of equal mass.


Hence, each part mass is {{{135/15}}} = 9 pounds.


The farmer got 5 pats of nitrogen, which is 5*9 = 45 pounds.
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