No it can't. It can be expanded though. 2/10, 4/20 etc.
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By dividing the numerator and denominator of the fraction by 3, 3/15 can be simplified to 1/5 or one fifth.
One fifth
If a fraction's numerator and denominator have no factors other than one in common, the fraction cannot be simplified except if the denominator is 1, in which case the fraction can be simplified to the whole number of the numerator.
It is probably 5/25.
One fifth as a fraction is 1/5