15/4 x 8/3 = 120/12 = 10
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Simplest form of 15 over 20 is 3/4.
The factors of 4 are 1, 2, 4 The factors of 15 are 1, 3, 5, 15
2/3 = 8/12 3/4 = 9/12
3 x 1/2 = 3/2 or 6/4. If you're adding 7/4 and 3/4 to that, the answer is 16/4, which equals 4.
The Greatest Common Factor of 12, 15 is 3.