Respuesta :
3 7/8 is left.
multiple 3 7/8 by 3 since there's 3 pieces cut.
then subtract 15 1/2 by 11 5/8 (the sum of the 3 boards) and you get your answer.
multiple 3 7/8 by 3 since there's 3 pieces cut.
then subtract 15 1/2 by 11 5/8 (the sum of the 3 boards) and you get your answer.