Bryan is 3 times as old as Adam now.
In 18 years time, their total age is 100 years.
How old is Bryan now?
- How old is Adam now?
- How many years is Adam younger than Bryan?
- How old was Bryan 29 years ago?
|
Bryan |
Adam |
Total |
Now |
3 u |
1 u |
4 u |
Change |
+ 18 |
+ 18 |
+ 36 |
18 years later |
3 u + 18 |
1 u + 18 |
100 |
(a)
Total age of Bryan and Adam now
= 100 - 36
= 64
Now
Bryan's age = 3 u
Adam's age = 1 u
Total age of Bryan and Adam = 4 u
4 u = 64
1 u = 64 ÷ 4 = 16
Adam's age now
= 1 u
= 16
(b)
Number of years that Adam is younger than Bryan
= 3 u - 1 u
= 2 u
= 2 x 16
= 32
(c)
Bryan's age 29 years' ago
= 3 u - 29
= 3 x 16 - 29
= 48 - 29
= 19
Answer(s): (a) 16; (b) 32; (c) 19