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Jorie is collecting rain water in 30 gallon and 50 gallon barrels. f represents the number of full 30 gallon barrels and g represents the number of full 50 gallon barrels.
Which expression describes the total volume of water collected?
A. 30( f + g )
B.80( f + g )
C. 30f + 50g
D.50f + 30g