Fill in the blanks.
Adam is 61 years old and
Bryan is 41 years old.
- Difference in their age now = _____
- Difference in their age when Adam was five times the age of Bryan = _____ u
- In how many years' before was Adam five times the age of Bryan?
- How old was Adam when he was five times the age of Bryan?
|
Adam |
Bryan |
Difference |
Before |
5 u |
1 u |
4 u |
Change |
+ ? |
+ ? |
|
After |
61 |
41 |
20 |
(a)
Change X times into units.
Difference in their age now
= 61 - 41
= 20
(b)
Difference in the age when Adam is five times the age of Bryan
= 5 u - 1 u
= 4 u
(c)
4 u = 20
1 u = 20 ÷ 4 = 5
Number of years before when Adam was five times the age of Bryan
= 41 - 1 u
= 41 - 5
= 36
(d)
Adam's age before when he was five times the age of Bryan
= 5 u
= 5 x 5
= 25
Answer(s): (a) 20; (b) 4; (c) 36; (d) 25