1. "So your kids are spaced a year apart, eh? Two boys, with the girl in the middle," Bob commented. "Yes," replied Robin. "The square of Ruth's age, added to the age of the younger boy and to the cube of the older, makes the square of their mother's age." What were their ages?

Children 9, 10 and 11 years old, mother 36.

Children 8, 9 and 10 years old, mother 33.

Children 10, 11 and 12 years old, mother 30.