You can think of lots of sets that don't contain a number; or that contain it for that matter. In this case, the most natural such set is probably the set of natural numbers, {0, 1, 2, 3, ...}. Another example would be the set of even numbers: {0, 2, -2, 4, -4, 6, -6, ...}.
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45
You can find out at Proofhouse.com in the Colt tables.
a number increased by -22 is 45. find the number
45/0.12 = 375 Therefore, the number that 45 is 12 percent of is 375.
15 is a factor of 45, but it is not a prime number.