1, 2, 5, and 10
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All of them. 1,2,5 and 10.
I think that these are the factors of 30: 1,2,3,5,6,10,15,30 The prime numbers that are also factors are: 2,3,5
The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30.Since the children are at school, and the sum of their ages, which are factors of the mother's age, is also a factor of the mother's age, then the children ages are 5 and 10 years old.
Factors of 30 are: 1, 2, 3, 5, 6, 10, 15, and 30. Factors of 40 are: 1, 2, 4, 5, 8, 10, 20, and 40. Find the greatest factor they both have in common. That is the greatest common factor.
Any number between 30 and 40 can be a factor. The common factors of 30 and 40 are 1, 2, 5 and 10.