Adam is 4 times as old as Bryan now.
In 5 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 18 years ago?
|
Adam |
Bryan |
Total |
Now |
4 u |
1 u |
5 u |
Change |
+ 5 |
+ 5 |
+ 10 |
5 years later |
4 u + 5 |
1 u + 5 |
90 |
(a)
Total age of Adam and Bryan now
= 90 - 10
= 80
Now
Adam's age = 4 u
Bryan's age = 1 u
Total age of Adam and Bryan = 5 u
5 u = 80
1 u = 80 ÷ 5 = 16
Bryan's age now
= 1 u
= 16
(b)
Number of years that Bryan is younger than Adam
= 4 u - 1 u
= 3 u
= 3 x 16
= 48
(c)
Adam's age 18 years' ago
= 4 u - 18
= 4 x 16 - 18
= 64 - 18
= 46
Answer(s): (a) 16; (b) 48; (c) 46