Adam is 7 times as old as Bryan now.
In 15 years time, their total age is 70 years.
How old is Adam now?
- How old is Bryan now?
- How many years is Bryan younger than Adam?
- How old was Adam 25 years ago?
|
Adam |
Bryan |
Total |
Now |
7 u |
1 u |
8 u |
Change |
+ 15 |
+ 15 |
+ 30 |
15 years later |
7 u + 15 |
1 u + 15 |
70 |
(a)
Total age of Adam and Bryan now
= 70 - 30
= 40
Now
Adam's age = 7 u
Bryan's age = 1 u
Total age of Adam and Bryan = 8 u
8 u = 40
1 u = 40 ÷ 8 = 5
Bryan's age now
= 1 u
= 5
(b)
Number of years that Bryan is younger than Adam
= 7 u - 1 u
= 6 u
= 6 x 5
= 30
(c)
Adam's age 25 years' ago
= 7 u - 25
= 7 x 5 - 25
= 35 - 25
= 10
Answer(s): (a) 5; (b) 30; (c) 10