A birthday cake was cut into equal pieces and four peices were eaten The fraction below shows how many pieces were left According to the fraction how many pieces were not eaten?

If the fraction representing the pieces left is, for example, ( \frac{n}{m} ), it means that ( n ) pieces are left out of a total of ( m ) pieces. Since four pieces were eaten, the number of pieces not eaten can be calculated as ( m - n ). To find the total number of pieces, you would add the eaten pieces to the remaining pieces, giving ( m = n + 4 ). Thus, the pieces not eaten would be ( m - 4 ).