Where does the 0.05 come from?

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bennyG19

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You have to raise the moisture content from 9% (initial) to 14% (optimum moisture content)... that is, raise the moisture content by 5%.

 
Just make sure you focus VERY carefully on the units... and you'll usually get to the right answer.

 
0.05 is the difference between the optimum moisture content (14%) and the moisture content of the soil upon arrival to the site (9%).

EDIT: Someone beat me to it :)

 
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