Bryan is 51 years old.
Adam is 36 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 |
51 |
36 |
15 |
(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
= 51 - 36
= 15
3 u = 15
1 u = 15 ÷ 3 = 5
Number of years' ago that Bryan was 4 times as old as Adam
= 36 - 5
= 31
(b)
Bryan's age 31 years ago
= 4 u
= 4 x 5
= 20
Answer(s): (a) 31; (b) 20