Question

The avg age of 5 children is 8 years. If the age of father be included the age is increased by 7 years. How old is father

Answer 1

Step-by-step explanation:

The average age of 5 children is 8 years. If the age of the father be included, the average is

increased by 7 years. Find the age of the father.

Let S = the sum of the children's ages

The average of the 5 children's ages = 8 = S/5 -> S = 40

Let the father's age = f

The average, including the father = 8 + 7 = 15 = (S+f)/6

Since S=40, we have

15 = (40+f)/6

f = 90 - 40 = 50

So the father is 50 years old

Answer 2

Step-by-step explanation:

AVERAGE IS 8

SUM = AVERAGE ×TOTAL NUMBER

= 8×5

=40

let father age be x

7+8=15= (Sum+ x)/6

15= 40+x/6

15×6=(40+x)

90=(40+x)

X = 90-40

X = 50

HOPE IT HELPS YOU