Adam was 4 times as old as Bryan 30 years ago.
Their total present age is 95 years now.
- How old is Adam now?
- How many years is Adam older than Bryan?
- How old is Bryan in 10 years' time?
| |
Adam |
Bryan |
Total |
| 30 years ago |
4 u |
1 u |
5 u |
| Change |
+ 30 |
+ 30 |
+ 60 |
| Present |
4 u + 30 |
1 u + 30 |
95 |
(a)
Total age of Adam and Bryan 30 years ago
= 95 - 60
= 35
30 years ago
Adam's age = 4 u
Bryan's age = 1 u
Total age of Adam and Bryan = 5 u
5 u + 60 = 95
5 u = 95 - 60 = 35
1 u = 35 ÷ 5 = 7
Adam's age now
= 4 u + 30
= 4 x 7 + 30
= 28 + 30
= 58
(b)
Number of years that Adam is older than Bryan
= 4 u - 1 u
= 3 u
= 3 x 7
= 21
(c)
Bryan's age in 10 years' time
= 1 u + 30 + 10
= 7 + 30 + 10
= 47
Answer(s): (a) 58; (b) 21; (c) 47
