Adam is 3 times as old as Bryan now.
In 20 years time, their total age is 100 years.
How old is Adam now?
- How old is Bryan now?
- How many years is Bryan younger than Adam?
- How old was Adam 41 years ago?
|
Adam |
Bryan |
Total |
Now |
3 u |
1 u |
4 u |
Change |
+ 20 |
+ 20 |
+ 40 |
20 years later |
3 u + 20 |
1 u + 20 |
100 |
(a)
Total age of Adam and Bryan now
= 100 - 40
= 60
Now
Adam's age = 3 u
Bryan's age = 1 u
Total age of Adam and Bryan = 4 u
4 u = 60
1 u = 60 ÷ 4 = 15
Bryan's age now
= 1 u
= 15
(b)
Number of years that Bryan is younger than Adam
= 3 u - 1 u
= 2 u
= 2 x 15
= 30
(c)
Adam's age 41 years' ago
= 3 u - 41
= 3 x 15 - 41
= 45 - 41
= 4
Answer(s): (a) 15; (b) 30; (c) 4