average age of family of 6 members is 22 years.age of the youngest member is 7 years.whart was the age of the family at the birth of the youngest?

• 90 years
  
  Total present age of family =6*22= 132
  Age of family 7 years before= 132-(7*6)=90
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• 90
  
  Total age is 22*6=132
  
  Before seven years of six members is 132-42= 90
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• 90 yrs
  (22*6-6*7)/5=18 avg age of family
  age of fam=18*5
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