Bryan is 10 times as old as Adam now.
In 23 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 38 years ago?
|
Bryan |
Adam |
Total |
Now |
10 u |
1 u |
11 u |
Change |
+ 23 |
+ 23 |
+ 46 |
23 years later |
10 u + 23 |
1 u + 23 |
90 |
(a)
Total age of Bryan and Adam now
= 90 - 46
= 44
Now
Bryan's age = 10 u
Adam's age = 1 u
Total age of Bryan and Adam = 11 u
11 u = 44
1 u = 44 ÷ 11 = 4
Adam's age now
= 1 u
= 4
(b)
Number of years that Adam is younger than Bryan
= 10 u - 1 u
= 9 u
= 9 x 4
= 36
(c)
Bryan's age 38 years' ago
= 10 u - 38
= 10 x 4 - 38
= 40 - 38
= 2
Answer(s): (a) 4; (b) 36; (c) 2