Bryan is 69 years old.
Adam is 21 years old.
A few years ago, Bryan was 4 times as old as Adam.
- How many years ago was Bryan 4 times as old as Adam?
- How old was Bryan then?
|
Bryan |
Adam |
Difference |
Before |
4 u |
1 u |
3 u |
Change |
+ ? |
+ ? |
|
After |
69 |
21 |
48 |
(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
= 69 - 21
= 48
3 u = 48
1 u = 48 ÷ 3 = 16
Number of years' ago that Bryan was 4 times as old as Adam
= 21 - 16
= 5
(b)
Bryan's age 5 years ago
= 4 u
= 4 x 16
= 64
Answer(s): (a) 5; (b) 64