Answer :
That would be:-
15 - 3(3 7/8) = 15 - 3(31/8) = 15 - 93/8 = 120/8 - 93/8 = 27/8 = 3 3/8 feet answer
15 - 3(3 7/8) = 15 - 3(31/8) = 15 - 93/8 = 120/8 - 93/8 = 27/8 = 3 3/8 feet answer