3 will go into both 15 and 27. 1 will go into any number, so also 1.
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The common factor of both 15 and 27 is 3.
42
The number which lies in between 6 and 27 is 16.5 which is derived by (6+27)/2.
41 is the prime number in this list.
The word increase means the problem is addition: 15 + x = 27. Reorder the problem so that it is subtraction: 27 - 15 = x and solve for x. X = 12.