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The difference between 6 and -2 is 8. The quotient 20/8 = 2.5
Composite numbers between 6 and 20 are 8, 9, 10, 12, 14, 15, 16, and 18.
Just 6
7 of them.
20 and 30 are rectangular numbers (4 * 5 and 5 * 6). There are none in between them.