Bryan was 4 times as old as Adam 15 years ago.
Their total present age is 55 years now.
- How old is Bryan now?
- How many years is Bryan older than Adam?
- How old is Adam in 5 years' time?
|
Bryan |
Adam |
Total |
15 years ago |
4 u |
1 u |
5 u |
Change |
+ 15 |
+ 15 |
+ 30 |
Present |
4 u + 15 |
1 u + 15 |
55 |
(a)
Total age of Bryan and Adam 15 years ago
= 55 - 30
= 25
15 years ago
Bryan's age = 4 u
Adam's age = 1 u
Total age of Bryan and Adam = 5 u
5 u + 30 = 55
5 u = 55 - 30 = 25
1 u = 25 ÷ 5 = 5
Bryan's age now
= 4 u + 15
= 4 x 5 + 15
= 20 + 15
= 35
(b)
Number of years that Bryan is older than Adam
= 4 u - 1 u
= 3 u
= 3 x 5
= 15
(c)
Adam's age in 5 years' time
= 1 u + 15 + 5
= 5 + 15 + 5
= 25
Answer(s): (a) 35; (b) 15; (c) 25