Fill in the blanks.
Adam is 23 years old and
Bryan is 2 years old.
- Difference in their age now = _____
- Difference in their age when Adam is four times the age of Bryan = _____ u
- In how many years' time will Adam be four times the age of Bryan?
- How old will Adam be when he will be four times the age of Bryan?
|
Adam |
Bryan |
Difference |
Before |
23 |
2 |
21 |
Change |
+ ? |
+ ? |
|
After |
4 u |
1 u |
3 u |
(a)
Change X times into units.
Difference in their age
= 23 - 2
= 21
(b)
Difference in the age when Adam is four times the age of Bryan
= 4 u - 1 u
= 3 u
(c)
3 u = 21
1 u = 21 ÷ 3 = 7
Number of years' time when Adam will be four times the age of Bryan
= 1 u - 2
= 7 - 2
= 5
(d)
Adam's age when he will be four times the age of Bryan
= 4 u
= 4 x 7
= 28
Answer(s): (a) 21; (b) 3; (c) 5; (d) 28