Bryan is 70 years old.
Adam is 19 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 |
70 |
19 |
51 |
(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
= 70 - 19
= 51
3 u = 51
1 u = 51 ÷ 3 = 17
Number of years' ago that Bryan was 4 times as old as Adam
= 19 - 17
= 2
(b)
Bryan's age 2 years ago
= 4 u
= 4 x 17
= 68
Answer(s): (a) 2; (b) 68