SOLUTION: father age is 4 times that of his son. 5yrs back, it was 7 times. his age now is?

Question 791007: father age is 4 times that of his son. 5yrs back, it was 7 times. his age now is?
Answer by Cromlix(4381) (Show Source): You can put this solution on YOUR website!
father age is 4 times that of his son.
F = 4S
5yrs back, it was 7 times.
F - 5 = 7(S - 5)
Replace F with 4S from first equation
4S - 5 = 7(S - 5)
4S - 5 = 7S - 35
Collect like terms
4S - 7S = -35 + 5
-3S = -30
S = 10.
Father's age = 40 years old
Son's age = 10 years old.
Hope this helps.
;-)

RELATED QUESTIONS
the present age of father is 35 years.3 years back his age was 4 times the age of his... (answered by ewatrrr)

the present age of father is 35 years.3 years back his age was 4 times the age of his... (answered by ranger)

three years ago father was 7 times as old as his son three year hence the fathers age... (answered by lwsshak3)

If the Fathers age is 5 times his son's age. 4 years back the father was 9 times older... (answered by Theo,ikleyn,kiks)

a father is now threes times as old as his son. Eight years ago the father's age was five (answered by ewatrrr)

Father' age was 7 times his son 5 years ago. After five years, he will be 3 times his... (answered by richwmiller)

a father is now twice in age to his son.20 years ago he was 12 times as old as his... (answered by lwsshak3)

Age of father 40. 5year early age of father was 7 times of his son. Find percent age of... (answered by josgarithmetic)

One year ago the father was 8 times as old as his son. Now, his age is the square of his... (answered by algebrahouse.com)