Answer:
So, age of fourth child is 15
Step-by-step explanation:
Given:
Average age = 15
Age of three children = 19 , 14 , 12
To Find:
Age of fourth child = ?
Solution:
From the given data we can see that there are total four children of Berger
So
Total Children = 4
Now let the age of fourth child be x
We know that
Average [tex]=\frac{Sum}{Total No}[/tex]
Putting in the values
15 [tex]=\frac{19+14+12+x}{4}[/tex]
Multiplying both sides by 4
15*4 [tex]=\frac{19+14+12+x}{4}*4[/tex]
it gives us
60 = 19+14+12+x
60 = 45 + x
subtracting 45 from both sides
60-45 = 45+x-45
15= x
or x=15
So age of fourth child is 15
