Adam was 4 times as old as Bryan 45 years ago.
Their total present age is 100 years now.
- How old is Adam now?
- How many years is Adam older than Bryan?
- How old is Bryan in 15 years' time?
|
Adam |
Bryan |
Total |
45 years ago |
4 u |
1 u |
5 u |
Change |
+ 45 |
+ 45 |
+ 90 |
Present |
4 u + 45 |
1 u + 45 |
100 |
(a)
Total age of Adam and Bryan 45 years ago
= 100 - 90
= 10
45 years ago
Adam's age = 4 u
Bryan's age = 1 u
Total age of Adam and Bryan = 5 u
5 u + 90 = 100
5 u = 100 - 90 = 10
1 u = 10 ÷ 5 = 2
Adam's age now
= 4 u + 45
= 4 x 2 + 45
= 8 + 45
= 53
(b)
Number of years that Adam is older than Bryan
= 4 u - 1 u
= 3 u
= 3 x 2
= 6
(c)
Bryan's age in 15 years' time
= 1 u + 45 + 15
= 2 + 45 + 15
= 62
Answer(s): (a) 53; (b) 6; (c) 62