The common factors of 140 and 210 are: 1, 2, 5, 7, 10, 14, 35, and 70
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The Greatest Common Factor (GCF) of 210 and 140 is 70.
The common factors of 120 and 140 are: 1, 2, 4, 5, 10, and 20
The common factors are: 1, 5, 7, 35
GCF(160, 210, 140) = 10 so the ratio is 16 : 21 : 14
Prime factors of 210 = 2 x 3 x 5 x 7Prime factors of 147 = 3 x 7 x 7Common factors = 3 x 7 so the highest common factor is 21.