Question 871984
Write an equation for each statement
:
a man is six times as old as his son.
m = 6s
:
 twenty years later, the man will be twice as old as his son.
m + 20 = 2(x+20)
m + 20 = 2s + 40
m = 2s + 40 - 20
m = 2s + 20
replace m with 6s (from the 1st statement)
6s = 2s + 20
6s - 2s = 20
4s = 20
s = 20/4
s = 5 yrs old is the son
then
6(5) =  30 yrs is the man's age
:
"Find the age of the man when his son was born"
30 - 5 = 25 yrs