Answer:
7/24
Step by step solution:
we have 12 equal pieces of the cake. one piece of a cake is 1/12 of the cake. One-half of the piece of cake is 1/12×1/2=1/24 of the cake. If each of the 7 children ate 1/2 of a piece of cake, that means 7×1/24=7/24 of the cake is gone.