Bryan was 4 times as old as Adam 25 years ago.
Their total present age is 70 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 |
25 years ago |
4 u |
1 u |
5 u |
Change |
+ 25 |
+ 25 |
+ 50 |
Present |
4 u + 25 |
1 u + 25 |
70 |
(a)
Total age of Bryan and Adam 25 years ago
= 70 - 50
= 20
25 years ago
Bryan's age = 4 u
Adam's age = 1 u
Total age of Bryan and Adam = 5 u
5 u + 50 = 70
5 u = 70 - 50 = 20
1 u = 20 ÷ 5 = 4
Bryan's age now
= 4 u + 25
= 4 x 4 + 25
= 16 + 25
= 41
(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 20 years' time
= 1 u + 25 + 20
= 4 + 25 + 20
= 49
Answer(s): (a) 41; (b) 12; (c) 49