Hi

how much will he have left after he builds the birdhouse

Has 6 3/4 ft, needing 3 4/5 feet for birdhouse

6 3/4 - 3 4/5  = 27/4 - 19/5 = 135/20 - 76/20 = 59/20 = 2 19/20 ft =  2.95 ft 

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