In a family of 5 members, the average age at present is 33 years. The youngest member is 9 years old. The average age of the family just before the birth of the youngest member was

In a family of 5 members, the average age at present is 33 years. The youngest member is 9 years old. The average age of the family just before the birth of the youngest member was
1). 30 years
2). 29 years
3). 25 years
4). 24 years

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Guest · Answer 1 · 2019-04-29 11:07:22

Given,

Number of member = 5

Average present age = 33 years

∴ Sum of present ages of 5 member

= (Number of members) × (Average present age)

= 5 × 33

= 165 years

Given, Age of youngest member = 9 years

∴ Sum of the ages of other 4 members just before the birth of youngest member

= Sum of present ages of 5 member - Age of youngest member – 4 × 9

= 165 – 9 – 36 = 120

∴ Average age of other 4 members just before the birth of youngest member

= 120/4 = 30 years

Guest · Answer 2 · 2019-05-19 17:23:46