2+5+9+12+18+18+20=84
84 divided by 7 (the amount of numbers you added) equals 12
so your answer is 12.
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The factors of 12 are 1, 2, 3, 4, 6, and 12The factors of 18 are 1, 2, 3, 6, 9, and 18The factors of 20 are 1, 2, 4, 5, 10, and 20The common factors of 12, 18 and 20 are 1 and 2The common factors of 12 and 18 are 1, 2, 3, and 6The common factors of 12 and 20 are 1, 2, and 4The common factors of 18 and 20 are 1 and 2The total number of factors for 12, 18 and 20 are all the same (6).
The GCF is 2.
You need to be careful in how you write such questions as it is important to know if you mean: x - 12/2 = 18 or (x-12)/2 = 18 If x - 12/2 = 18 then x = 18 + 12/2 x = 18 + 6 x = 24 If (x-12)/2 = 18 then x - 12 = 18 * 2 x - 12 = 36 x = 36 + 12 x = 48
2, 4, 6, 8, 10, 12, 14, 16, 18, 20
The prime factorization of 12 is: 2 X 2 X 3 The prime factorization of 18 is: 2 X 3 X 3 The prime factorization of 20 is: 2 X 2 X 5