Bryan is 4 times as old as Adam now.
In 20 years time, their total age is 80 years.
How old is Bryan now?
- How old is Adam now?
- How many years is Adam younger than Bryan?
- How old was Bryan 13 years ago?
|
Bryan |
Adam |
Total |
Now |
4 u |
1 u |
5 u |
Change |
+ 20 |
+ 20 |
+ 40 |
20 years later |
4 u + 20 |
1 u + 20 |
80 |
(a)
Total age of Bryan and Adam now
= 80 - 40
= 40
Now
Bryan's age = 4 u
Adam's age = 1 u
Total age of Bryan and Adam = 5 u
5 u = 40
1 u = 40 ÷ 5 = 8
Adam's age now
= 1 u
= 8
(b)
Number of years that Adam is younger than Bryan
= 4 u - 1 u
= 3 u
= 3 x 8
= 24
(c)
Bryan's age 13 years' ago
= 4 u - 13
= 4 x 8 - 13
= 32 - 13
= 19
Answer(s): (a) 8; (b) 24; (c) 19