Adam is 49 years old.
Bryan is 10 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 |
49 |
10 |
39 |
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
= 49 - 10
= 39
3 u = 39
1 u = 39 ÷ 3 = 13
Number of years' time when Adam will be 4 times as old as Bryan
= 13 - 10
= 3
(b)
Adam's age in 3 years' time
= 4 u
= 4 x 13
= 52
Answer(s): (a) 3; (b) 52