Bryan was 4 times as old as Adam 5 years ago.
Their total present age is 30 years now.
- How old is Bryan now?
- How many years is Bryan older than Adam?
- How old is Adam in 15 years' time?
| |
Bryan |
Adam |
Total |
| 5 years ago |
4 u |
1 u |
5 u |
| Change |
+ 5 |
+ 5 |
+ 10 |
| Present |
4 u + 5 |
1 u + 5 |
30 |
(a)
Total age of Bryan and Adam 5 years ago
= 30 - 10
= 20
5 years ago
Bryan's age = 4 u
Adam's age = 1 u
Total age of Bryan and Adam = 5 u
5 u + 10 = 30
5 u = 30 - 10 = 20
1 u = 20 ÷ 5 = 4
Bryan's age now
= 4 u + 5
= 4 x 4 + 5
= 16 + 5
= 21
(b)
Number of years that Bryan is older than Adam
= 4 u - 1 u
= 3 u
= 3 x 4
= 12
(c)
Adam's age in 15 years' time
= 1 u + 5 + 15
= 4 + 5 + 15
= 24
Answer(s): (a) 21; (b) 12; (c) 24
