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One possible set, out of infinitely many, is positive irrational numbers.
There are no subsets of irrational numbers. There are subsets of rational numbers, however.
Elements can belong to subsets. Subsets can be elements of sets that are called "power sets".
It is not possible to answer the question without information about the set B.All that can be said is that if set B has n elements, that is, if the cardinality if B is n, then there are 2n possible subsets of B.
5 subsets of 4 and of 1, 10 subsets of 3 and of 2 adds up to 30.