There are no GCFs of one number, but I'm sure you just mean factors.
So, the factors are:
1, 2, 5, 10, 25, 50
(Technically, 1 is not a factor, and neither is 50, because factors of a number are any number that goes into it other than 1, and their-selves, but i thought I'd include them anyways)
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I'll exchange them for the numbers you want to know the GCF of.
The factors of 15 are: 1, 3, 5, 15The factors of 27 are: 1, 3, 9, 27The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3
50-50 methods = 0
50
10 percent off 50 = 4510% off of 50= 10% discount applied to 50= 50 - (10% * 50)= 50 - (0.10 * 50)= 50 - 5= 45