Well, darling, the number that sits snugly between 12 and 15 is 13. It's like the middle child of that numerical family, not too big, not too small, just right. So, there you have it, 13 is the lucky winner in this number sandwich.
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The numbers between 10 and 20 that are not prime are 12, 14, 15, 16 and 18. So 15 is the odd number and the rest are even numbers.
15/1.25 = 12 Therefore, the number that 15 is 125 percent of, is 12.
The number half-way between is 15. 11, 12, 13, 14, 15, 16, 17, 18, 19 are all between 10 and 20.