Bryan is 10 years old. The total age of Bryan and Adam is 50 years. How many years' time will the ratio of Bryan's age to Adam's age be 2 : 5?
|
Bryan |
Adam |
Total |
Difference |
Before |
10 |
40 |
50 |
30 |
Change |
+ ? |
+ ? |
|
|
After |
2 u |
5 u |
|
3 u |
Adam's age
= 50 - 10
= 40
Difference in the age between Bryan and Adam
= 40 - 10
= 30
Difference in the age between Bryan and Adam in units
= 5 u - 2 u
= 3 u
3 u = 30
1 u = 30 ÷ 3 = 10
Bryan's age now = 10
Bryan's age after = 2 u = 2 x 10 = 20
Number of years' time
= 20 - 10
= 10
Answer(s): 10