Fill in the blanks.
Adam is 21 years old and
Bryan is 3 years old.
- Difference in their age now = _____
- Difference in their age when Adam is thrice the age of Bryan = _____ u
- In how many years' time will Adam be thrice the age of Bryan?
- How old will Adam be when he will be thrice the age of Bryan?
|
Adam |
Bryan |
Difference |
Before |
21 |
3 |
18 |
Change |
+ ? |
+ ? |
|
After |
3 u |
1 u |
2 u |
(a)
Change X times into units.
Difference in their age
= 21 - 3
= 18
(b)
Difference in the age when Adam is thrice the age of Bryan
= 3 u - 1 u
= 2 u
(c)
2 u = 18
1 u = 18 ÷ 2 = 9
Number of years' time when Adam will be thrice the age of Bryan
= 1 u - 3
= 9 - 3
= 6
(d)
Adam's age when he will be thrice the age of Bryan
= 3 u
= 3 x 9
= 27
Answer(s): (a) 18; (b) 2; (c) 6; (d) 27