Family's Age Unexpectation
John's family have 4 people - Father , Mother , John and John's little sister. Father is 2 years older than mother. John is 4 years older than John's litter sister. Now, average of all family members' age is 22.5 but sumation of all member is 64 year. Find different of father's age and little sister's age.
The answer is 34.
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