If I wanted to be nasty about it, I would say 1, because the least common denominator of 45/1 and 75/1 is 1. The least common denominator of two fractions is the least common multiple of their denominators. I presume you are asking for the least common multiple of 45 and 75, which is 225.
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9 over 15. You divide them both by a common denominator in this case 5.
A common denominator is 75.
45 over 75 in lowest terms is 3/5
LCD(75, 275) = 825
The common denominator of any two or more whole numbers will always be 1.