Bryan is 5 times as old as Adam now.
In 10 years time, their total age is 50 years.
How old is Bryan now?
- How old is Adam now?
- How many years is Adam younger than Bryan?
- How old was Bryan 21 years ago?
|
Bryan |
Adam |
Total |
Now |
5 u |
1 u |
6 u |
Change |
+ 10 |
+ 10 |
+ 20 |
10 years later |
5 u + 10 |
1 u + 10 |
50 |
(a)
Total age of Bryan and Adam now
= 50 - 20
= 30
Now
Bryan's age = 5 u
Adam's age = 1 u
Total age of Bryan and Adam = 6 u
6 u = 30
1 u = 30 ÷ 6 = 5
Adam's age now
= 1 u
= 5
(b)
Number of years that Adam is younger than Bryan
= 5 u - 1 u
= 4 u
= 4 x 5
= 20
(c)
Bryan's age 21 years' ago
= 5 u - 21
= 5 x 5 - 21
= 25 - 21
= 4
Answer(s): (a) 5; (b) 20; (c) 4