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16
7 groups, with 3 in each3 groups, with 7 in each21 groups, with 1 in each1 group, with 21 in each
2 groups of 16, 4 groups of 8, 8 groups of 4, 16 groups of 2. Not really divided or in groups, but there could be 1 group of 32 or everyone by themselves.
If, by "equal groups", you mean groups of equal things, you get how many in all [the total number] by simply addingthem all together. Sometimes adding is called summation.If, by "equal groups", you mean equal-sized groups of things, you get how many in all by multiplying the number of groups by the number of things in each member group.The number of things in a group is also called its cardinality. Loosely, cardinality is the size of the group, or the number of elements ["things"] in the group.
3 there are 6 thirds total, in 2. If you group the thirds in groups of 2 then you will have 3 groups or 6 thirds divided by 2 = 3