Bryan is 3 times as old as Adam now.
In 15 years time, their total age is 90 years.
How old is Bryan now?
- How old is Adam now?
- How many years is Adam younger than Bryan?
- How old was Bryan 35 years ago?
|
Bryan |
Adam |
Total |
Now |
3 u |
1 u |
4 u |
Change |
+ 15 |
+ 15 |
+ 30 |
15 years later |
3 u + 15 |
1 u + 15 |
90 |
(a)
Total age of Bryan and Adam now
= 90 - 30
= 60
Now
Bryan's age = 3 u
Adam's age = 1 u
Total age of Bryan and Adam = 4 u
4 u = 60
1 u = 60 ÷ 4 = 15
Adam's age now
= 1 u
= 15
(b)
Number of years that Adam is younger than Bryan
= 3 u - 1 u
= 2 u
= 2 x 15
= 30
(c)
Bryan's age 35 years' ago
= 3 u - 35
= 3 x 15 - 35
= 45 - 35
= 10
Answer(s): (a) 15; (b) 30; (c) 10