Bryan was 6 times as old as Adam 15 years ago.
Their total present age is 65 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 |
15 years ago |
6 u |
1 u |
7 u |
Change |
+ 15 |
+ 15 |
+ 30 |
Present |
6 u + 15 |
1 u + 15 |
65 |
(a)
Total age of Bryan and Adam 15 years ago
= 65 - 30
= 35
15 years ago
Bryan's age = 6 u
Adam's age = 1 u
Total age of Bryan and Adam = 7 u
7 u + 30 = 65
7 u = 65 - 30 = 35
1 u = 35 ÷ 7 = 5
Bryan's age now
= 6 u + 15
= 6 x 5 + 15
= 30 + 15
= 45
(b)
Number of years that Bryan is older than Adam
= 6 u - 1 u
= 5 u
= 5 x 5
= 25
(c)
Adam's age in 20 years' time
= 1 u + 15 + 20
= 5 + 15 + 20
= 40
Answer(s): (a) 45; (b) 25; (c) 40