Bryan was 6 times as old as Adam 5 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 20 years' time?
|
Bryan |
Adam |
Total |
5 years ago |
6 u |
1 u |
7 u |
Change |
+ 5 |
+ 5 |
+ 10 |
Present |
6 u + 5 |
1 u + 5 |
80 |
(a)
Total age of Bryan and Adam 5 years ago
= 80 - 10
= 70
5 years ago
Bryan's age = 6 u
Adam's age = 1 u
Total age of Bryan and Adam = 7 u
7 u + 10 = 80
7 u = 80 - 10 = 70
1 u = 70 ÷ 7 = 10
Bryan's age now
= 6 u + 5
= 6 x 10 + 5
= 60 + 5
= 65
(b)
Number of years that Bryan is older than Adam
= 6 u - 1 u
= 5 u
= 5 x 10
= 50
(c)
Adam's age in 20 years' time
= 1 u + 5 + 20
= 10 + 5 + 20
= 35
Answer(s): (a) 65; (b) 50; (c) 35