Answer:
He will have 21 pieces of the sandwich left
Explanation:
Steve buys a large sandwich for a party.
He cuts it into thirds. This means that he cuts it into 3 pieces.
Then, he cuts each third into eight pieces. This means that each of the 3 pieces was cut into 8 different pieces.
Mathematically:
3 * 8 = 24 pieces
After he eats three of the pieces, the number of pieces he has left will be:
24 - 3 = 21 pieces
He will have 21 pieces of the sandwich left.