Joe's father will be twice his age 6 years from now. His mother was twice his age 2 years before. If Joe will be 24 two years from now, what is the difference between his father's and mother's age?

Joe will be 24 two years from now, so his present age is 22. Six years from now Joe will be 28, making his father twice that, which is 56, and his father's present age is 50. Two years before the present Joe was 20, so his mother was twice that, which is 40, and her present age is 42. The difference between 50 and 42 is 8.

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