Question 892888
a father was 30 years old when his son was born,he is now 3 times as old as his son.Find their present age.In how many years will the son be half as old as his father.
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let x=son's present age
30+x=father's present age
..
30+x=3x
2x=30
x=15
30+x=45
son's present age=15
father's present age=45
..
let y=years son will be half as old as his father
15+y=(45+y)/2
30+2y=45+y
y=15
In how many years will the son be half as old as his father. 15