The average age of a Husband and his wife is 39 years. Six years ago, the ratio between their ages was 6 ∶  5. What is the difference between the present ages of the husband and his wife?

The average age of a Husband and his wife is 39 years. Six years ago, the ratio between their ages was 6 ∶  5. What is the difference between the present ages of the husband and his wife?
1). 12 years
2). 6 years
3). 3 years
4). 4 years

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