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?
Given, 3 years ago, the average age of 3 siblings was 13 years Average =
(Sum‌of‌ages‌of‌persons)
Number‌of‌persons
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 =