Bryan is 4 times as old as Adam now.
In 10 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 24 years ago?
|
Bryan |
Adam |
Total |
Now |
4 u |
1 u |
5 u |
Change |
+ 10 |
+ 10 |
+ 20 |
10 years later |
4 u + 10 |
1 u + 10 |
100 |
(a)
Total age of Bryan and Adam now
= 100 - 20
= 80
Now
Bryan's age = 4 u
Adam's age = 1 u
Total age of Bryan and Adam = 5 u
5 u = 80
1 u = 80 ÷ 5 = 16
Adam's age now
= 1 u
= 16
(b)
Number of years that Adam is younger than Bryan
= 4 u - 1 u
= 3 u
= 3 x 16
= 48
(c)
Bryan's age 24 years' ago
= 4 u - 24
= 4 x 16 - 24
= 64 - 24
= 40
Answer(s): (a) 16; (b) 48; (c) 40