Fill in the blanks.
The ratio of Adam's stickers to Bryan's stickers is 7 : 3.
After Bryan gives 90 stickers away,
The ratio of Adam's stickers to Bryan's stickers becomes 4 : 1.
- Whose number of stickers has 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 = _____
|
Adam |
Bryan |
Before |
7 x 4 = 28 u |
3 x 4 = 12 u |
Change |
|
- 90 |
After |
4 x 7 = 28 u |
1 x 7 = 7 u |
(a)
Change ratio into units.
The number of stickers that Bryan (1) has remains unchanged.
(b)
LCM of 7 and 4 = 28
Number of stickers that Adam has = 28 u
(c)
Change in the number of stickers that Bryan has
= 12 u - 7 u
= 5 u
(d)
Number of stickers that Bryan gives away = 90
5 u = 90
1 u = 90 ÷ 5 = 18
Answer(s): (a) 1; (b) 28; (c) 5; (d) 18