Fill in the blanks.
Adam is 39 years old and
Bryan is 9 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 |
39 |
9 |
30 |
Change |
+ ? |
+ ? |
|
After |
3 u |
1 u |
2 u |
(a)
Change X times into units.
Difference in their age
= 39 - 9
= 30
(b)
Difference in the age when Adam is thrice the age of Bryan
= 3 u - 1 u
= 2 u
(c)
2 u = 30
1 u = 30 ÷ 2 = 15
Number of years' time when Adam will be thrice the age of Bryan
= 1 u - 9
= 15 - 9
= 6
(d)
Adam's age when he will be thrice the age of Bryan
= 3 u
= 3 x 15
= 45
Answer(s): (a) 30; (b) 2; (c) 6; (d) 45