Adam is 9 times as old as Bryan now.
In 15 years time, their total age is 80 years.
How old is Adam now?
- How old is Bryan now?
- How many years is Bryan younger than Adam?
- How old was Adam 33 years ago?
|
Adam |
Bryan |
Total |
Now |
9 u |
1 u |
10 u |
Change |
+ 15 |
+ 15 |
+ 30 |
15 years later |
9 u + 15 |
1 u + 15 |
80 |
(a)
Total age of Adam and Bryan now
= 80 - 30
= 50
Now
Adam's age = 9 u
Bryan's age = 1 u
Total age of Adam and Bryan = 10 u
10 u = 50
1 u = 50 ÷ 10 = 5
Bryan's age now
= 1 u
= 5
(b)
Number of years that Bryan is younger than Adam
= 9 u - 1 u
= 8 u
= 8 x 5
= 40
(c)
Adam's age 33 years' ago
= 9 u - 33
= 9 x 5 - 33
= 45 - 33
= 12
Answer(s): (a) 5; (b) 40; (c) 12