Bryan is 9 times as old as Adam now.
In 20 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 11 years ago?
|
Bryan |
Adam |
Total |
Now |
9 u |
1 u |
10 u |
Change |
+ 20 |
+ 20 |
+ 40 |
20 years later |
9 u + 20 |
1 u + 20 |
90 |
(a)
Total age of Bryan and Adam now
= 90 - 40
= 50
Now
Bryan's age = 9 u
Adam's age = 1 u
Total age of Bryan and Adam = 10 u
10 u = 50
1 u = 50 ÷ 10 = 5
Adam's age now
= 1 u
= 5
(b)
Number of years that Adam is younger than Bryan
= 9 u - 1 u
= 8 u
= 8 x 5
= 40
(c)
Bryan's age 11 years' ago
= 9 u - 11
= 9 x 5 - 11
= 45 - 11
= 34
Answer(s): (a) 5; (b) 40; (c) 34