Adam is 25 years old.
Bryan is 4 years old.
In a few years' time, Adam will be 4 times as old as Bryan.
- In how many years' time will Adam be 4 times as old as Bryan?
- How old will Adam be by that time?
|
Adam |
Bryan |
Difference |
Before |
25 |
4 |
21 |
Change |
+ ? |
+ ? |
|
After |
4 u |
1 u |
3 u |
(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
= 25 - 4
= 21
3 u = 21
1 u = 21 ÷ 3 = 7
Number of years' time when Adam will be 4 times as old as Bryan
= 7 - 4
= 3
(b)
Adam's age in 3 years' time
= 4 u
= 4 x 7
= 28
Answer(s): (a) 3; (b) 28