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11 and 10
The sum of the ages of husband and his wife is four times the sum of the ages of their children.Four years ago,the ratio of the sum of their ages of their to the sum of the ages of their children was 18:1 two years hence the ratio will be 3:1. How many children do they have.
Assuming that having boys and girls are equally likely, then the probability is 1/8. * * * * * You also need to assume that the children's genders are independent. They are NOT and depend on the parents' ages and genes.
Persia or the black death
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.