son's present age: x
father's present age : y
4 yrs from now:
son : x+4
father : y+4
y+4 = 3(x+4)
y = 3x + 8
6 yrs ago:
son : x-6
y - 6 = 7(x-6)
y = 7x -36
so 7x -36 =3x+8
4x = 44
x = 11
y = 3(11)+8 = 41
The son is now 11 and the father is now 41
4 yrs from now: son-- 15, father 45
3 times as old? yes
6 yrs ago: son -- 5, father 35
7 times as old? yes
all is good
Thank you very much Reiny!
algebra - a boy is b years old and his father is 6 times as old as him. find the...
general ability - Stephen is 14 years old. In 13 years time he will be 3 fifths ...
English - 1. I have a mother, father and brother. 2. I have Mother, Father, and ...
Math - Translate this situation into a system of equations of the first degree ...
6th Grade Math - Sara is 1/4 the age of her father. Sara's father is 60. How ...
Math - Hector rain in the city charity race for four years. His times in minutes...
mathematics - the average age of a family of six is 25 years.The average age of ...
math - A. Lisa is 15 years old and her father is 40. How many years ago was the ...
algebra - Im feeling like an old parent. Please help. Charles is one-third as ...
MATH - 1. A father is three times as old as his son. Five years ago the sum of ...