How many of the positive factors of 16 are not factors of 20  Answers.
A) 2	B) 3	C) 4	D) 1	E) 5
factors of 16 - 1, 2, 4, 8, 16   factors of 20 -1, 2, 4, 5, 10, 20.   Comparing both, we have 2 factors of 16 which are not factors of 20- 8,16   2nswer: 2
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How many of the positive factors of 16 are not factors of 20