The answer is usually written as:5c
If you want the result as a number, that will depend on how much "c" is.
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the numbers that make 18 mulitplyed together are 1,2,3,6,9 ect
-3
c + c + c + c + c = 5 * c.
33
In the key of C major, 2-5-1 is Dm-G7-C