book Maths Puzzle Numerical Ability

dont understand this one I can get the answer in my head but dont know have to write it in an equation. the ans. is 12

The sum of three consecutive even numbers is 36. Find the numbers.

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book Other Question

What is the domain of the function f(x)=3x-3 when the range is R:{3,-7,-9}? Graphing a compound linear inequality on the number line

Graph the portion of the number line containing all points for which
x<_ -2 or x >_ 3 (Note: I couldn't get the dash