Bryan is 43 years old.
Adam is 4 years old.
In a few years' time, Bryan will be 4 times as old as Adam.
- In how many years' time will Bryan be 4 times as old as Adam?
- How old will Bryan be by that time?
|
Bryan |
Adam |
Difference |
Before |
43 |
4 |
39 |
Change |
+ ? |
+ ? |
|
After |
4 u |
1 u |
3 u |
(a)
For Bryan to be 4 times as old as Adam,
Adam's age = 1 u
Bryan's age = 4 u
Difference in their age
= 4 u - 1 u
= 3 u
Age difference between Bryan and Adam
= 43 - 4
= 39
3 u = 39
1 u = 39 ÷ 3 = 13
Number of years' time when Bryan will be 4 times as old as Adam
= 13 - 4
= 9
(b)
Bryan's age in 9 years' time
= 4 u
= 4 x 13
= 52
Answer(s): (a) 9; (b) 52