Bryan was 4 times as old as Adam 35 years ago.
Their total present age is 100 years now.
- How old is Bryan now?
- How many years is Bryan older than Adam?
- How old is Adam in 20 years' time?
|
Bryan |
Adam |
Total |
35 years ago |
4 u |
1 u |
5 u |
Change |
+ 35 |
+ 35 |
+ 70 |
Present |
4 u + 35 |
1 u + 35 |
100 |
(a)
Total age of Bryan and Adam 35 years ago
= 100 - 70
= 30
35 years ago
Bryan's age = 4 u
Adam's age = 1 u
Total age of Bryan and Adam = 5 u
5 u + 70 = 100
5 u = 100 - 70 = 30
1 u = 30 ÷ 5 = 6
Bryan's age now
= 4 u + 35
= 4 x 6 + 35
= 24 + 35
= 59
(b)
Number of years that Bryan is older than Adam
= 4 u - 1 u
= 3 u
= 3 x 6
= 18
(c)
Adam's age in 20 years' time
= 1 u + 35 + 20
= 6 + 35 + 20
= 61
Answer(s): (a) 59; (b) 18; (c) 61