Three of them are 60, 100, 150.
10,20,30
This question cannot be answered as all three numbers do not share a common factor. 2 has 2 as its only factor 5 has 5 as its only factor 10 has 2 and 5 as its factors. As you can see the three numbers do not contain a common factor, but 10 does have both the other numbers as factors.
They are: 30, 60 and 90
1, 2 and 5
10, 20, 30.
10, 20, 30
10, 20, 30
Just 1. The three numbers have no common prime factors because 5 is not a multiple of 2.
The lowest common multiple of 5, 2, and 7 is 70
20, 40, 60
30, 60, 90
The prime factors of 100 are 2, 2, 5, and 5. The prime factors of 120 are 2, 2, 2, 3, and 5. The prime factors of 180 are 2, 2, 3, 3, and 5. The prime factors that all three numbers have in common are 2, 2, and 5. Therefore, the greatest common factor is 2 x 2 x 5 = 20.