Bryan is 4 times as old as Adam now.
In 35 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 10 years ago?
|
Bryan |
Adam |
Total |
Now |
4 u |
1 u |
5 u |
Change |
+ 35 |
+ 35 |
+ 70 |
35 years later |
4 u + 35 |
1 u + 35 |
90 |
(a)
Total age of Bryan and Adam now
= 90 - 70
= 20
Now
Bryan's age = 4 u
Adam's age = 1 u
Total age of Bryan and Adam = 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Adam's age now
= 1 u
= 4
(b)
Number of years that Adam is younger than Bryan
= 4 u - 1 u
= 3 u
= 3 x 4
= 12
(c)
Bryan's age 10 years' ago
= 4 u - 10
= 4 x 4 - 10
= 16 - 10
= 6
Answer(s): (a) 4; (b) 12; (c) 6