Adam is 20 years old. The total age of Adam and Bryan is 60 years. How many years' time will the ratio of Adam's age to Bryan's age be 3 : 5?
|
Adam |
Bryan |
Total |
Difference |
Before |
20 |
40 |
60 |
20 |
Change |
+ ? |
+ ? |
|
|
After |
3 u |
5 u |
|
2 u |
Bryan's age
= 60 - 20
= 40
Difference in the age between Adam and Bryan
= 40 - 20
= 20
Difference in the age between Adam and Bryan in units
= 5 u - 3 u
= 2 u
2 u = 20
1 u = 20 ÷ 2 = 10
Adam's age now = 20
Adam's age after = 3 u = 3 x 10 = 30
Number of years' time
= 30 - 20
= 10
Answer(s): 10