Bryan is 9 times as old as Adam now.
In 5 years time, their total age is 90 years.
How old is Bryan now?
- How old is Adam now?
- How many years is Adam younger than Bryan?
- How old was Bryan 43 years ago?
|
Bryan |
Adam |
Total |
Now |
9 u |
1 u |
10 u |
Change |
+ 5 |
+ 5 |
+ 10 |
5 years later |
9 u + 5 |
1 u + 5 |
90 |
(a)
Total age of Bryan and Adam now
= 90 - 10
= 80
Now
Bryan's age = 9 u
Adam's age = 1 u
Total age of Bryan and Adam = 10 u
10 u = 80
1 u = 80 ÷ 10 = 8
Adam's age now
= 1 u
= 8
(b)
Number of years that Adam is younger than Bryan
= 9 u - 1 u
= 8 u
= 8 x 8
= 64
(c)
Bryan's age 43 years' ago
= 9 u - 43
= 9 x 8 - 43
= 72 - 43
= 29
Answer(s): (a) 8; (b) 64; (c) 29