In 1930 a person's age was 8 times that of his son. In 1938 the father's age becomes 10 times the age of his son's age in 1930. The ages of father and son in 1940 were respectively.

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In 1930 a person's age was 8 times that of his son. In 1938 the father's age becomes 10 times the age of his son's age in 1930. The ages of father and son in 1940 were respectively.






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