The number of elements in the union of sets A and B is 160, and the number of elements in the intersection of sets A and B is 20. If the number of elements in set A is 50, what is the number of elements in set B?

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The number of elements in the union of sets <em>A</em> and <em>B</em> is 160, and the number of elements in the intersection of sets <em>A</em> and <em>B</em> is 20. If the number of elements in set <em>A</em> is 50, what is the number of elements in set <em>B</em>?