Question 1011376
f, father's age
f-7, father's age seven years back
f+14, father after 14 years
s, son's age


seven years back the age of father was 5 times of the age of his son.
{{{f-7=5(s-7)}}}


it(father's age) will be twice after 14 years.
{{{f+14=2(s+14)}}}


Solve this system for f and s.
{{{system(f-7=5s-35,f+14=2s+28)}}}