Bryan is 5 times as old as Adam now.
In 6 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 9 years ago?
|
Bryan |
Adam |
Total |
Now |
5 u |
1 u |
6 u |
Change |
+ 6 |
+ 6 |
+ 12 |
6 years later |
5 u + 6 |
1 u + 6 |
90 |
(a)
Total age of Bryan and Adam now
= 90 - 12
= 78
Now
Bryan's age = 5 u
Adam's age = 1 u
Total age of Bryan and Adam = 6 u
6 u = 78
1 u = 78 ÷ 6 = 13
Adam's age now
= 1 u
= 13
(b)
Number of years that Adam is younger than Bryan
= 5 u - 1 u
= 4 u
= 4 x 13
= 52
(c)
Bryan's age 9 years' ago
= 5 u - 9
= 5 x 13 - 9
= 65 - 9
= 56
Answer(s): (a) 13; (b) 52; (c) 56