Bryan was 5 times as old as Adam 10 years ago.
Their total present age is 80 years now.
- How old is Bryan now?
- How many years is Bryan older than Adam?
- How old is Adam in 30 years' time?
|
Bryan |
Adam |
Total |
10 years ago |
5 u |
1 u |
6 u |
Change |
+ 10 |
+ 10 |
+ 20 |
Present |
5 u + 10 |
1 u + 10 |
80 |
(a)
Total age of Bryan and Adam 10 years ago
= 80 - 20
= 60
10 years ago
Bryan's age = 5 u
Adam's age = 1 u
Total age of Bryan and Adam = 6 u
6 u + 20 = 80
6 u = 80 - 20 = 60
1 u = 60 ÷ 6 = 10
Bryan's age now
= 5 u + 10
= 5 x 10 + 10
= 50 + 10
= 60
(b)
Number of years that Bryan is older than Adam
= 5 u - 1 u
= 4 u
= 4 x 10
= 40
(c)
Adam's age in 30 years' time
= 1 u + 10 + 30
= 10 + 10 + 30
= 50
Answer(s): (a) 60; (b) 40; (c) 50