Fill in the blanks.
The ratio of Bryan's stickers to Adam's stickers is 8 : 9.
After Bryan gives 20 stickers away,
The ratio of Bryan's stickers to Adam's stickers becomes 4 : 5.
- Whose number of stickers has not changed? Give the answer in number. (Eg Bryan = 1; Adam = 2)
- Number of stickers that Adam has = _____ u
- Change in the number of stickers that Bryan has = _____ u
- 1 u = _____
|
Bryan |
Adam |
Before |
8 x 5 = 40 u |
9 x 5 = 45 u |
Change |
- 20 |
|
After |
4 x 9 = 36 u |
5 x 9 = 45 u |
(a)
Change ratio into units.
The number of stickers that Adam (2) has remains unchanged.
(b)
LCM of 9 and 5 = 45
Number of stickers that Adam has = 45 u
(c)
Change in the number of stickers that Bryan has
= 40 u - 36 u
= 4 u
(d)
Number of stickers that Bryan gives away = 20
4 u = 20
1 u = 20 ÷ 4 = 5
Answer(s): (a) 2; (b) 45; (c) 4; (d) 5