Bryan is 47 years old.
Adam is 7 years old.
In a few years' time, Bryan will be 3 times as old as Adam.
- In how many years' time will Bryan be 3 times as old as Adam?
- How old will Bryan be by that time?
|
Bryan |
Adam |
Difference |
Before |
47 |
7 |
40 |
Change |
+ ? |
+ ? |
|
After |
3 u |
1 u |
2 u |
(a)
For Bryan to be 3 times as old as Adam,
Adam's age = 1 u
Bryan's age = 3 u
Difference in their age
= 3 u - 1 u
= 2 u
Age difference between Bryan and Adam
= 47 - 7
= 40
2 u = 40
1 u = 40 ÷ 2 = 20
Number of years' time when Bryan will be 3 times as old as Adam
= 20 - 7
= 13
(b)
Bryan's age in 13 years' time
= 3 u
= 3 x 20
= 60
Answer(s): (a) 13; (b) 60