Adam is 9 times as old as Bryan now.
In 25 years time, their total age is 80 years.
How old is Adam now?
- How old is Bryan now?
- How many years is Bryan younger than Adam?
- How old was Adam 19 years ago?
|
Adam |
Bryan |
Total |
Now |
9 u |
1 u |
10 u |
Change |
+ 25 |
+ 25 |
+ 50 |
25 years later |
9 u + 25 |
1 u + 25 |
80 |
(a)
Total age of Adam and Bryan now
= 80 - 50
= 30
Now
Adam's age = 9 u
Bryan's age = 1 u
Total age of Adam and Bryan = 10 u
10 u = 30
1 u = 30 ÷ 10 = 3
Bryan's age now
= 1 u
= 3
(b)
Number of years that Bryan is younger than Adam
= 9 u - 1 u
= 8 u
= 8 x 3
= 24
(c)
Adam's age 19 years' ago
= 9 u - 19
= 9 x 3 - 19
= 27 - 19
= 8
Answer(s): (a) 3; (b) 24; (c) 8