Fill in the blanks.
Adam is 75 years old and
Bryan is 21 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 |
75 |
21 |
54 |
(a)
Change X times into units.
Difference in their age now
= 75 - 21
= 54
(b)
Difference in the age when Adam is thrice the age of Bryan
= 3 u - 1 u
= 2 u
(c)
2 u = 54
1 u = 54 ÷ 2 = 27
Number of years before when Adam was thrice the age of Bryan
= 21 - 1 u
= 21 - 27
= -6
(d)
Adam's age before when he was thrice the age of Bryan
= 3 u
= 3 x 27
= 81
Answer(s): (a) 54; (b) 2; (c) -6; (d) 81