10 years ago, the average age of family of 6 people was N years. After 5 years a child was born in the family and one year after his birth, the average age again found to be N years. what is the value of N.
Answers
Answered by
0
Answer:
The value of N is 97
Step-by-step explanation:
Let the sum of present ages of the 6 people be x
before 10 years sum of their ages = x-60
After 5 years the sum of their ages= x+ 30 , after 1 year from there including the new born baby the sum of ages = x+37
Both the averages equal to N
(x-60)÷6 =(x+37)÷7
7x - 420 = 6x +222
x= 642
Substituting the value of x (x-60)÷6=N
N=97
Similar questions