Adam is 4 times as old as Bryan now.
In 15 years time, their total age is 100 years.
How old is Adam now?
- How old is Bryan now?
- How many years is Bryan younger than Adam?
- How old was Adam 43 years ago?
|
Adam |
Bryan |
Total |
Now |
4 u |
1 u |
5 u |
Change |
+ 15 |
+ 15 |
+ 30 |
15 years later |
4 u + 15 |
1 u + 15 |
100 |
(a)
Total age of Adam and Bryan now
= 100 - 30
= 70
Now
Adam's age = 4 u
Bryan's age = 1 u
Total age of Adam and Bryan = 5 u
5 u = 70
1 u = 70 ÷ 5 = 14
Bryan's age now
= 1 u
= 14
(b)
Number of years that Bryan is younger than Adam
= 4 u - 1 u
= 3 u
= 3 x 14
= 42
(c)
Adam's age 43 years' ago
= 4 u - 43
= 4 x 14 - 43
= 56 - 43
= 13
Answer(s): (a) 14; (b) 42; (c) 13