1.

3 years ago, the average age of 3 siblings was 13 years. At present the sum of age of father and mother is 82 years. At present what is the average age of whole family?1). 31 years2). 27 years3). 24 years4). 26 years

Answer»

Given,

3 years AGO, the average age of 3 siblings was 13 years

Average = (Sum of ages of PERSONS)/Number of persons

Sum of ages of 3 siblings before 3 years = 13 × 3 = 39 years

Sum of ages of 3 siblings at PRESENT = 39 + 9 = 48 years.

Given,

At present the sum of age of father and MOTHER is 82 years.

At present Sum of ages of whole family

= Sum of ages of 3 siblings at present + Sum of ages of Father and mother at present

⇒ 48 + 82 = 130 years

Average = (Sum of ages of whole family after 4 years)/5

Average = 130/5 = 26 years.

∴ The average age of whole family after 4 years is 26 years.


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