Fill in the blanks.
The ratio of Adam's stickers to Bryan's stickers is 3 : 7.
After Adam gives 80 stickers away,
The ratio of Adam's stickers to Bryan's stickers becomes 1 : 3.
- 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 |
3 x 3 = 9 u |
7 x 3 = 21 u |
Change |
- 80 |
|
After |
1 x 7 = 7 u |
3 x 7 = 21 u |
(a)
Change ratio into units.
The number of stickers that Bryan (2) has remains unchanged.
(b)
LCM of 7 and 3 = 21
Number of stickers that Bryan has = 21 u
(c)
Change in the number of stickers that Adam has
= 9 u - 7 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) 21; (c) 2; (d) 40