Question

a father and his son are respectively 50 years and 20 years old.Find the ratio of father age to his son age when

1. the son was 10 years old
2.the father was 35 years old
3. the son will be 40 years old
4.the father will be 75 years old

Answer 1

1. if son was 10 years old then father was 40 years old so
40:10=4:1
2. if father was 35 years old then son's age was 5 year old
35:5=7:1
3. if son age will be 40 then father's age will be 70 years
70:40=7:4
4. if father age will be 75 years then son's age will be 45 years
75:45=5:3

Answer 2

father age - son's age = 30
(1) when son age is 10
father age-10=30
father age=40
(2) when father age is 35 then
35-son age=30
son age=5
(3) when the son will be 40 years
father age - son age =30
father age- 40=30
father age= 70

(4). when father will be 75 year old
father age- son's age= 30
75-son's age = 30
son age is 45