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Table 1-
5 children every child gets 1/5 of a bar of a chocolate.

Table 2
There are 10 children - every person gets 1/5 of 2 bars

Table 3-
There are 15 children and every one gets 1/5 of 3 chocolate bars.

(15+10+5 children= 30 children)
I drew pictures of the tables. I knew that the amount of people there were on table one would be the amount that the children would get out of one whole. On table two the amount of children there would be would get that amount of bars of chocolate but doubled. on table three if there are three bars every child can have 1/5 but there would be 15 children because 3x5=15 and 15 + 5+10=30.