Fill in the blanks.
Bryan is 72 years old and
Adam is 32 years old.
- Difference in their age now = _____
- Difference in their age when Bryan was thrice the age of Adam = _____ u
- In how many years' before was Bryan thrice the age of Adam?
- How old was Bryan when he was thrice the age of Adam?
|
Bryan |
Adam |
Difference |
Before |
3 u |
1 u |
2 u |
Change |
+ ? |
+ ? |
|
After |
72 |
32 |
40 |
(a)
Change X times into units.
Difference in their age now
= 72 - 32
= 40
(b)
Difference in the age when Bryan is thrice the age of Adam
= 3 u - 1 u
= 2 u
(c)
2 u = 40
1 u = 40 ÷ 2 = 20
Number of years before when Bryan was thrice the age of Adam
= 32 - 1 u
= 32 - 20
= 12
(d)
Bryan's age before when he was thrice the age of Adam
= 3 u
= 3 x 20
= 60
Answer(s): (a) 40; (b) 2; (c) 12; (d) 60