Adam is 40 years old.
Bryan is 4 years old.
In a few years' time, Adam will be 3 times as old as Bryan.
- In how many years' time will Adam be 3 times as old as Bryan?
- How old will Adam be by that time?
|
Adam |
Bryan |
Difference |
Before |
40 |
4 |
36 |
Change |
+ ? |
+ ? |
|
After |
3 u |
1 u |
2 u |
(a)
For Adam to be 3 times as old as Bryan,
Bryan's age = 1 u
Adam's age = 3 u
Difference in their age
= 3 u - 1 u
= 2 u
Age difference between Adam and Bryan
= 40 - 4
= 36
2 u = 36
1 u = 36 ÷ 2 = 18
Number of years' time when Adam will be 3 times as old as Bryan
= 18 - 4
= 14
(b)
Adam's age in 14 years' time
= 3 u
= 3 x 18
= 54
Answer(s): (a) 14; (b) 54