Bryan is 42 years old.
Adam is 24 years old.
A few years ago, Bryan was 3 times as old as Adam.
- How many years ago was Bryan 3 times as old as Adam?
- How old was Bryan then?
|
Bryan |
Adam |
Difference |
Before |
3 u |
1 u |
2 u |
Change |
+ ? |
+ ? |
|
After |
42 |
24 |
18 |
(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
= 42 - 24
= 18
2 u = 18
1 u = 18 ÷ 2 = 9
Number of years' ago that Bryan was 3 times as old as Adam
= 24 - 9
= 15
(b)
Bryan's age 15 years ago
= 3 u
= 3 x 9
= 27
Answer(s): (a) 15; (b) 27