Adam is 3 times as old as Bryan now.
In 23 years time, their total age is 90 years.
How old is Adam now?
- How old is Bryan now?
- How many years is Bryan younger than Adam?
- How old was Adam 20 years ago?
|
Adam |
Bryan |
Total |
Now |
3 u |
1 u |
4 u |
Change |
+ 23 |
+ 23 |
+ 46 |
23 years later |
3 u + 23 |
1 u + 23 |
90 |
(a)
Total age of Adam and Bryan now
= 90 - 46
= 44
Now
Adam's age = 3 u
Bryan's age = 1 u
Total age of Adam and Bryan = 4 u
4 u = 44
1 u = 44 ÷ 4 = 11
Bryan's age now
= 1 u
= 11
(b)
Number of years that Bryan is younger than Adam
= 3 u - 1 u
= 2 u
= 2 x 11
= 22
(c)
Adam's age 20 years' ago
= 3 u - 20
= 3 x 11 - 20
= 33 - 20
= 13
Answer(s): (a) 11; (b) 22; (c) 13