22.
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The first composite number greater than 21 is 22.
34+21 = 55 and 70-21 = 55
There are infinitely many numbers less than -20 but greater than -21 (it's a long explanation), with a few examples being -20.11111111, -20.5, and -6.5(2143/22)^0.25.
No.The mixed number 21/2, for example, is greater than the whole number 2, but smaller than the whole number 3.In fact, given any mixed number (which does have a fractional part), it is always possible to find a pair of consecutive whole numbers such that the mixed number is between them.
21 ft > 4 yds