Explanation

Initially, the whole cake is 8/8 (which is equal to 1).

If 2/8 part of the cake has been eaten, that means 2/8 has been subtracted from the whole cake.

So, the remaining fraction of the cake is:

8/8 - 2/8 = 6/8

Now, we can simplify the fraction 6/8 by dividing both numerator and denominator by 2, which gives us:

6/8 = 3/4