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aginter18
18/5 or 3 and 3/5. I did this on my calculator. If you have one of the graphing ones, just use decimal to fraction. 
3.6 is a fraction greater than one, since 3 is 3 wholes, the 6 is the numerator, is the denominator. So 3.6 can be written as 36/10 or 18/5, if you want do write it in mixed number it would be 3 3/5.