The common factors are: 1, 5, 7, 35
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The common factors of 120 and 140 are: 1, 2, 4, 5, 10, and 20
The prime factors of 105 are 3, 5, and 7.The prime factors of 126 are 2, 3, 3, and 7.Therefore the prime factors that 105 and 126 have in common are 3, and 7.
The common factors of 140 and 210 are: 1, 2, 5, 7, 10, 14, 35, and 70
105/75=1.4 1.4 X 100=140% 140%
42 prime factors -----> 2,3,7 105 prime factors -----> 3,5,7 There is 3 and 7 in common : There fore 3*7 = 21; 21 is the greatest common factor.