Fill in the blanks.
The ratio of Adam's stickers to Bryan's stickers is 1 : 7.
After Adam gives 20 stickers away,
The ratio of Adam's stickers to Bryan's stickers becomes 1 : 9.
- 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 |
1 x 9 = 9 u |
7 x 9 = 63 u |
Change |
- 20 |
|
After |
1 x 7 = 7 u |
9 x 7 = 63 u |
(a)
Change ratio into units.
The number of stickers that Bryan (2) has remains unchanged.
(b)
LCM of 7 and 9 = 63
Number of stickers that Bryan has = 63 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 = 20
2 u = 20
1 u = 20 ÷ 2 = 10
Answer(s): (a) 2; (b) 63; (c) 2; (d) 10