Fill in the blanks.
Bryan is 72 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 |
72 |
24 |
48 |
(a)
Change X times into units.
Difference in their age now
= 72 - 24
= 48
(b)
Difference in the age when Bryan is four times the age of Adam
= 4 u - 1 u
= 3 u
(c)
3 u = 48
1 u = 48 ÷ 3 = 16
Number of years before when Bryan was four times the age of Adam
= 24 - 1 u
= 24 - 16
= 8
(d)
Bryan's age before when he was four times the age of Adam
= 4 u
= 4 x 16
= 64
Answer(s): (a) 48; (b) 3; (c) 8; (d) 64