Adam is 8 times as old as Bryan now.
In 5 years time, their total age is 100 years.
How old is Adam now?
- How old is Bryan now?
- How many years is Bryan younger than Adam?
- How old was Adam 43 years ago?
|
Adam |
Bryan |
Total |
Now |
8 u |
1 u |
9 u |
Change |
+ 5 |
+ 5 |
+ 10 |
5 years later |
8 u + 5 |
1 u + 5 |
100 |
(a)
Total age of Adam and Bryan now
= 100 - 10
= 90
Now
Adam's age = 8 u
Bryan's age = 1 u
Total age of Adam and Bryan = 9 u
9 u = 90
1 u = 90 ÷ 9 = 10
Bryan's age now
= 1 u
= 10
(b)
Number of years that Bryan is younger than Adam
= 8 u - 1 u
= 7 u
= 7 x 10
= 70
(c)
Adam's age 43 years' ago
= 8 u - 43
= 8 x 10 - 43
= 80 - 43
= 37
Answer(s): (a) 10; (b) 70; (c) 37