Bryan is 3 times as old as Adam now.
In 10 years time, their total age is 60 years.
How old is Bryan now?
- How old is Adam now?
- How many years is Adam younger than Bryan?
- How old was Bryan 15 years ago?
|
Bryan |
Adam |
Total |
Now |
3 u |
1 u |
4 u |
Change |
+ 10 |
+ 10 |
+ 20 |
10 years later |
3 u + 10 |
1 u + 10 |
60 |
(a)
Total age of Bryan and Adam now
= 60 - 20
= 40
Now
Bryan's age = 3 u
Adam's age = 1 u
Total age of Bryan and Adam = 4 u
4 u = 40
1 u = 40 ÷ 4 = 10
Adam's age now
= 1 u
= 10
(b)
Number of years that Adam is younger than Bryan
= 3 u - 1 u
= 2 u
= 2 x 10
= 20
(c)
Bryan's age 15 years' ago
= 3 u - 15
= 3 x 10 - 15
= 30 - 15
= 15
Answer(s): (a) 10; (b) 20; (c) 15