The GCF is 1.
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20: 1, 2, 4, 5, 10, 20 36: 1, 2, 3, 4, 6, 9, 18, 36 The GCF is 4.
The GCF is 9. From C2H5.OH: This is wrong. The GCF is 4 (6 x 4, 10 x 4, 9 x 4)
The GCF of 9 and 20 is 1
GCF(4, 7, 9) = 1.
7/20 + 9/10 = 7/20 + 18/20 = 25/20 = 5/4