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It kind of depends on what "these" sets are.
The empty set, any set with one element (for example, {1} or {x}, any set with two elements (for example, {1, 3}, or {a, b}, or {"John", "Mary"}, any set with three elements, etc.
The lowest common factor (the smallest positive whole number which divides into all the numbers without any remainder) of 3, 4, 16 is 1, as it is for any set of numbers. The highest common factor (the largest positive whole number which divides into all the numbers without any remainder) is also 1. The lowest common multiple ((the smallest positive whole number into which divide all the numbers without any remainder, ie the smallest positive whole number which is a multiple of all the numbers) is 48.
an empty set does not have any element
To find out how many sets of 20 are in 700, you would divide 700 by 20. This division would result in 35 sets of 20 in 700. Each set of 20 would be a whole number without any remainder.