Bryan is 47 years old.
Adam is 5 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 |
47 |
5 |
42 |
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
= 47 - 5
= 42
3 u = 42
1 u = 42 ÷ 3 = 14
Number of years' time when Bryan will be 4 times as old as Adam
= 14 - 5
= 9
(b)
Bryan's age in 9 years' time
= 4 u
= 4 x 14
= 56
Answer(s): (a) 9; (b) 56