Fill in the blanks.
Adam is 23 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 |
23 |
3 |
20 |
Change |
+ ? |
+ ? |
|
After |
3 u |
1 u |
2 u |
(a)
Change X times into units.
Difference in their age
= 23 - 3
= 20
(b)
Difference in the age when Adam is thrice the age of Bryan
= 3 u - 1 u
= 2 u
(c)
2 u = 20
1 u = 20 ÷ 2 = 10
Number of years' time when Adam will be thrice the age of Bryan
= 1 u - 3
= 10 - 3
= 7
(d)
Adam's age when he will be thrice the age of Bryan
= 3 u
= 3 x 10
= 30
Answer(s): (a) 20; (b) 2; (c) 7; (d) 30