Fill in the blanks.
Adam is 71 years old and
Bryan is 39 years old.
- Difference in their age now = _____
- Difference in their age when Adam was thrice the age of Bryan = _____ u
- In how many years' before was Adam thrice the age of Bryan?
- How old was Adam when he was thrice the age of Bryan?
|
Adam |
Bryan |
Difference |
Before |
3 u |
1 u |
2 u |
Change |
+ ? |
+ ? |
|
After |
71 |
39 |
32 |
(a)
Change X times into units.
Difference in their age now
= 71 - 39
= 32
(b)
Difference in the age when Adam is thrice the age of Bryan
= 3 u - 1 u
= 2 u
(c)
2 u = 32
1 u = 32 ÷ 2 = 16
Number of years before when Adam was thrice the age of Bryan
= 39 - 1 u
= 39 - 16
= 23
(d)
Adam's age before when he was thrice the age of Bryan
= 3 u
= 3 x 16
= 48
Answer(s): (a) 32; (b) 2; (c) 23; (d) 48