18/45 = 2/5 or 0.4
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45% is also the same as 45:100 which would reduce down to 9:20 in it's simplest form.
14:45 written as a fraction in simplest form is 1/3
8/45 is in simplest form.
Since the antecedent of the ratio 1:45 is 1, it cannot be divided any further leaving an integer antecedent. Therefore, 1:45 is already expressed in its simplest form.
45/72 = 5/8