Based on the fact that the cakes were originally of the same size, but then some of them were leftover, the size of the leftover slices in relation to the original slices are:
The proportion of the chocolate cake slices is relation to the original size of cake is:
= Leftover percentage / Number of slices
Solving gives:
= 1/5 ÷ 4
= 1/25
The proportion of the vanilla cake slices in relation to the original slice is:
= 2/8 ÷ 5
= 1/16
In conclusion, each chocolate slice is 1/25 of the original cake and each vanilla slice is 1/16.
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