Fill in the blanks.
Bryan is 69 years old and
Adam is 24 years old.
- Difference in their age now = _____
- Difference in their age when Bryan was four times the age of Adam = _____ u
- In how many years' before was Bryan four times the age of Adam?
- How old was Bryan when he was four times the age of Adam?
|
Bryan |
Adam |
Difference |
Before |
4 u |
1 u |
3 u |
Change |
+ ? |
+ ? |
|
After |
69 |
24 |
45 |
(a)
Change X times into units.
Difference in their age now
= 69 - 24
= 45
(b)
Difference in the age when Bryan is four times the age of Adam
= 4 u - 1 u
= 3 u
(c)
3 u = 45
1 u = 45 ÷ 3 = 15
Number of years before when Bryan was four times the age of Adam
= 24 - 1 u
= 24 - 15
= 9
(d)
Bryan's age before when he was four times the age of Adam
= 4 u
= 4 x 15
= 60
Answer(s): (a) 45; (b) 3; (c) 9; (d) 60