A cake is split into two pieces. The larger piece from the initial cut is then split into four equal pieces. Let’s say the smaller piece from the first cut combined with two of the tiny pieces from the second cut forms 70% of the cake. Finally, the smaller piece from the first cut is split into two equal halves. How much of the cake is one of those halves?
20%.
After the first cut, the cake is split into a 40% piece and a 60% piece. The 60% piece is then cut into four 15% pieces, so 40% + 15% + 15% makes 70% of the cake. Then, the 40% piece from the first cut is split into two 20% pieces.