Steps to Determine the Number of Unsold Pieces:

Calculate the Total Number of Pieces:

Each pie is cut into 8 pieces, and there are 3 pies in total.
Total pieces = 3 pies × 8 pieces per pie = 24 pieces.
Determine How Many Pieces Were Sold:

Three-quarters of the total pieces were sold.
Pieces sold = ¾ × 24 pieces = 18 pieces.
Calculate the Number of Pieces Not Sold:

Subtract the number of pieces sold from the total number of pieces.
Pieces not sold = 24 pieces – 18 pieces = 6 pieces.
Therefore, 6 pieces were not sold.