15/100 = 3/20 .
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9/15 = 3/5
515 in an integer, not a fraction!
It is 15/50 which you can simplify if you so wish.
As far as simplify meaning finding a smaller denominator, the answer is no. The only common factor between 19 and 15 is 1, so the fraction cannot be reduced, but it is an improper fraction, so you could turn it into a mixed number: 19/15 = 1 4/15.
To simplify a fraction, you find a number that can be divided by the fraction you are simplifying. sometimes this does not always work and the fraction can not be simplified.