Adam is 8 times as old as Bryan now.
In 18 years time, their total age is 90 years.
How old is Adam now?
- How old is Bryan now?
- How many years is Bryan younger than Adam?
- How old was Adam 25 years ago?
|
Adam |
Bryan |
Total |
Now |
8 u |
1 u |
9 u |
Change |
+ 18 |
+ 18 |
+ 36 |
18 years later |
8 u + 18 |
1 u + 18 |
90 |
(a)
Total age of Adam and Bryan now
= 90 - 36
= 54
Now
Adam's age = 8 u
Bryan's age = 1 u
Total age of Adam and Bryan = 9 u
9 u = 54
1 u = 54 ÷ 9 = 6
Bryan's age now
= 1 u
= 6
(b)
Number of years that Bryan is younger than Adam
= 8 u - 1 u
= 7 u
= 7 x 6
= 42
(c)
Adam's age 25 years' ago
= 8 u - 25
= 8 x 6 - 25
= 48 - 25
= 23
Answer(s): (a) 6; (b) 42; (c) 23