Fill in the blanks.
Adam is 74 years old and
Bryan is 29 years old.
- Difference in their age now = _____
- Difference in their age when Adam was four times the age of Bryan = _____ u
- In how many years' before was Adam four times the age of Bryan?
- How old was Adam when he was four times the age of Bryan?
|
Adam |
Bryan |
Difference |
Before |
4 u |
1 u |
3 u |
Change |
+ ? |
+ ? |
|
After |
74 |
29 |
45 |
(a)
Change X times into units.
Difference in their age now
= 74 - 29
= 45
(b)
Difference in the age when Adam is four times the age of Bryan
= 4 u - 1 u
= 3 u
(c)
3 u = 45
1 u = 45 ÷ 3 = 15
Number of years before when Adam was four times the age of Bryan
= 29 - 1 u
= 29 - 15
= 14
(d)
Adam's age before when he was four times the age of Bryan
= 4 u
= 4 x 15
= 60
Answer(s): (a) 45; (b) 3; (c) 14; (d) 60