Bryan was 3 times as old as Adam 35 years ago.
Their total present age is 90 years now.
- How old is Bryan now?
- How many years is Bryan older than Adam?
- How old is Adam in 25 years' time?
| |
Bryan |
Adam |
Total |
| 35 years ago |
3 u |
1 u |
4 u |
| Change |
+ 35 |
+ 35 |
+ 70 |
| Present |
3 u + 35 |
1 u + 35 |
90 |
(a)
Total age of Bryan and Adam 35 years ago
= 90 - 70
= 20
35 years ago
Bryan's age = 3 u
Adam's age = 1 u
Total age of Bryan and Adam = 4 u
4 u + 70 = 90
4 u = 90 - 70 = 20
1 u = 20 ÷ 4 = 5
Bryan's age now
= 3 u + 35
= 3 x 5 + 35
= 15 + 35
= 50
(b)
Number of years that Bryan is older than Adam
= 3 u - 1 u
= 2 u
= 2 x 5
= 10
(c)
Adam's age in 25 years' time
= 1 u + 35 + 25
= 5 + 35 + 25
= 65
Answer(s): (a) 50; (b) 10; (c) 65
