The average age of a family of four members is 23 years. The age of youngest member is 5 years. Find the average age of the family just before the birth of youngest member.

The average age of a family of four members is 23 years. The age of youngest member is 5 years. Find the average age of the family just before the birth of youngest member.

1). 12
2). 15
3). 32
4). None of these

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