Bryan is 7 times as old as Adam now.
In 30 years time, their total age is 100 years.
How old is Bryan now?
- How old is Adam now?
- How many years is Adam younger than Bryan?
- How old was Bryan 7 years ago?
|
Bryan |
Adam |
Total |
Now |
7 u |
1 u |
8 u |
Change |
+ 30 |
+ 30 |
+ 60 |
30 years later |
7 u + 30 |
1 u + 30 |
100 |
(a)
Total age of Bryan and Adam now
= 100 - 60
= 40
Now
Bryan's age = 7 u
Adam's age = 1 u
Total age of Bryan and Adam = 8 u
8 u = 40
1 u = 40 ÷ 8 = 5
Adam's age now
= 1 u
= 5
(b)
Number of years that Adam is younger than Bryan
= 7 u - 1 u
= 6 u
= 6 x 5
= 30
(c)
Bryan's age 7 years' ago
= 7 u - 7
= 7 x 5 - 7
= 35 - 7
= 28
Answer(s): (a) 5; (b) 30; (c) 28