Fill in the blanks.
The ratio of Adam's stickers to Bryan's stickers is 4 : 9.
After Adam gives 80 stickers away,
The ratio of Adam's stickers to Bryan's stickers becomes 2 : 5.
- Whose number of stickers has not changed? Give the answer in number. (Eg Adam = 1; Bryan = 2)
- Number of stickers that Bryan has = _____ u
- Change in the number of stickers that Adam has = _____ u
- 1 u = _____
|
Adam |
Bryan |
Before |
4 x 5 = 20 u |
9 x 5 = 45 u |
Change |
- 80 |
|
After |
2 x 9 = 18 u |
5 x 9 = 45 u |
(a)
Change ratio into units.
The number of stickers that Bryan (2) has remains unchanged.
(b)
LCM of 9 and 5 = 45
Number of stickers that Bryan has = 45 u
(c)
Change in the number of stickers that Adam has
= 20 u - 18 u
= 2 u
(d)
Number of stickers that Adam gives away = 80
2 u = 80
1 u = 80 ÷ 2 = 40
Answer(s): (a) 2; (b) 45; (c) 2; (d) 40