Bryan is 9 times as old as Adam now.
In 10 years time, their total age is 60 years.
How old is Bryan now?
- How old is Adam now?
- How many years is Adam younger than Bryan?
- How old was Bryan 20 years ago?
|
Bryan |
Adam |
Total |
Now |
9 u |
1 u |
10 u |
Change |
+ 10 |
+ 10 |
+ 20 |
10 years later |
9 u + 10 |
1 u + 10 |
60 |
(a)
Total age of Bryan and Adam now
= 60 - 20
= 40
Now
Bryan's age = 9 u
Adam's age = 1 u
Total age of Bryan and Adam = 10 u
10 u = 40
1 u = 40 ÷ 10 = 4
Adam's age now
= 1 u
= 4
(b)
Number of years that Adam is younger than Bryan
= 9 u - 1 u
= 8 u
= 8 x 4
= 32
(c)
Bryan's age 20 years' ago
= 9 u - 20
= 9 x 4 - 20
= 36 - 20
= 16
Answer(s): (a) 4; (b) 32; (c) 16