Adam is 3 times as old as Bryan now.
In 36 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 10 years ago?
|
Adam |
Bryan |
Total |
Now |
3 u |
1 u |
4 u |
Change |
+ 36 |
+ 36 |
+ 72 |
36 years later |
3 u + 36 |
1 u + 36 |
100 |
(a)
Total age of Adam and Bryan now
= 100 - 72
= 28
Now
Adam's age = 3 u
Bryan's age = 1 u
Total age of Adam and Bryan = 4 u
4 u = 28
1 u = 28 ÷ 4 = 7
Bryan's age now
= 1 u
= 7
(b)
Number of years that Bryan is younger than Adam
= 3 u - 1 u
= 2 u
= 2 x 7
= 14
(c)
Adam's age 10 years' ago
= 3 u - 10
= 3 x 7 - 10
= 21 - 10
= 11
Answer(s): (a) 7; (b) 14; (c) 11