Answer:
[tex]9\frac{5}{8}\ inches[/tex]
Step-by-step explanation:
The original board is 40 1/8 inch and it is cut in 3 pieces of equal length:
New boards = [tex]40\frac{1}{8} : 3 = \frac{321}{8} * \frac{1}{3} = \frac{107}{8}[/tex]
And now he cuts again 3 3/4 inches off of each one of the new boards (substracts)
[tex]\frac{107}{8} - 3\frac{3}{4} =\frac{107}{8} -\frac{15}{4} =\frac{107-30}{8} =\frac{77}{8} =9\frac{5}{8} \ inches[/tex]
