Bryan is 8 times as old as Adam now.
In 18 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 18 years ago?
|
Bryan |
Adam |
Total |
Now |
8 u |
1 u |
9 u |
Change |
+ 18 |
+ 18 |
+ 36 |
18 years later |
8 u + 18 |
1 u + 18 |
90 |
(a)
Total age of Bryan and Adam now
= 90 - 36
= 54
Now
Bryan's age = 8 u
Adam's age = 1 u
Total age of Bryan and Adam = 9 u
9 u = 54
1 u = 54 ÷ 9 = 6
Adam's age now
= 1 u
= 6
(b)
Number of years that Adam is younger than Bryan
= 8 u - 1 u
= 7 u
= 7 x 6
= 42
(c)
Bryan's age 18 years' ago
= 8 u - 18
= 8 x 6 - 18
= 48 - 18
= 30
Answer(s): (a) 6; (b) 42; (c) 30