Adam is 54 years old.
Bryan is 45 years old.
A few years ago, Adam was 4 times as old as Bryan.
- How many years ago was Adam 4 times as old as Bryan?
- How old was Adam then?
|
Adam |
Bryan |
Difference |
Before |
4 u |
1 u |
3 u |
Change |
+ ? |
+ ? |
|
After |
54 |
45 |
9 |
(a)
For Adam to be 4 times as old as Bryan,
Bryan's age = 1 u
Adam's age = 4 u
Difference in their age
= 4 u - 1 u
= 3 u
Age difference between Adam and Bryan
= 54 - 45
= 9
3 u = 9
1 u = 9 ÷ 3 = 3
Number of years' ago that Adam was 4 times as old as Bryan
= 45 - 3
= 42
(b)
Adam's age 42 years ago
= 4 u
= 4 x 3
= 12
Answer(s): (a) 42; (b) 12