The current average age of a family of five members is 24. If the present age of the youngest member in the family is 8 years, what was the average age of the family members just before the birth of this youngest member?

20 years

Sum of age of family of 5 members = 5 × 24 = 120 years

Total age of family before birth of  youngest member = 120 - 5 × 8 = 80 years

Avergae age of family of 4 members 8 years ago = \(\frac{80}{4}\)

= 20 years