divide both by 5
5/5 = 1
15/5 = 3
so 5/15 = 1/3
Answer: one third
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The simplified fraction of 15/21 is 5/7.
12/15 = 4/5.
3/5.9/15 can be simplified to 3/5 by dividing top and bottom of the fraction by 3.
5 over 6. However, this is a fraction, not a ratio
The simplified fraction of 12 over 20 is 3/5