4 cakes were shared among children. Each child got 2 upon 9 of a cake. How many children were there in the group?

To find the number of children, we first convert the total amount of cake into ninths. Since there are 4 cakes, that equals 4 × 9 = 36 ninths. If each child received ( \frac{2}{9} ) of a cake, we can divide the total ninths by the amount each child received: ( 36 ÷ 2 = 18 ). Therefore, there were 18 children in the group.