Bryan is 67 years old.
Adam is 28 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 |
67 |
28 |
39 |
(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
= 67 - 28
= 39
3 u = 39
1 u = 39 ÷ 3 = 13
Number of years' ago that Bryan was 4 times as old as Adam
= 28 - 13
= 15
(b)
Bryan's age 15 years ago
= 4 u
= 4 x 13
= 52
Answer(s): (a) 15; (b) 52