Fill in the blanks.
Bryan is 77 years old and
Adam is 57 years old.
- Difference in their age now = _____
- Difference in their age when Bryan was five times the age of Adam = _____ u
- In how many years' before was Bryan five times the age of Adam?
- How old was Bryan when he was five times the age of Adam?
|
Bryan |
Adam |
Difference |
Before |
5 u |
1 u |
4 u |
Change |
+ ? |
+ ? |
|
After |
77 |
57 |
20 |
(a)
Change X times into units.
Difference in their age now
= 77 - 57
= 20
(b)
Difference in the age when Bryan is five times the age of Adam
= 5 u - 1 u
= 4 u
(c)
4 u = 20
1 u = 20 ÷ 4 = 5
Number of years before when Bryan was five times the age of Adam
= 57 - 1 u
= 57 - 5
= 52
(d)
Bryan's age before when he was five times the age of Adam
= 5 u
= 5 x 5
= 25
Answer(s): (a) 20; (b) 4; (c) 52; (d) 25