Reasoning and solution:/

The 3 elements:

The amount in each group: 2/9 of a cake

The number of groups: 3

The total amount in all the groups: the amount of the cake by 3 people?

We multiply the amount in each group, 2/9 of the cake, with the number of groups, 3, to find the total amount of cake in all 3 groups, the total amount of cake all 3 people had:

3 x 2/9 of the cake =6/9 of the cake =2/3 of the cake

They three had 2/3 of the cake altogether.

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