1/3
Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 15, 15/45 is equal to 1/3 or one third.
It's 1/3 since 15 is one third of 45.
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45/15
Cancel dpwn by #5#
9/3
Cancel down by '3'
3/1
The '1' is trivial, so the answer is '3'.