Because 4 doesn't divide into 15 evenly with no remainder.
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Try to find a common factor between 15 and 12. Then divide both by this common factor.5/4 or 1 and 1/4
4/30 just factor out a 2 2/15 ------ so 2/15 = 2/15 ========
The Greatest Common Factor of 28 and 60 is four. 28 divided by 4 is 7, and 60 divided by 4 is 15. To show that it is the greatest 7 nor 15 can be reduced.
2/15 * 25/4 cancelling out the common factor of 2 in 2 and 4: = 1/15 * 25/2 cancelling out the common factor of 5 in 15 and 25: = 1/3 * 5/2 multiplying numerators and denominators: = 5/6
No but 15 is a factor of 75