Fill in the blanks.
2 boys, Adam and Bryan, have some stickers.
The ratio of Adam's to Bryan's stickers is 2 : 1.
Adam gives 22 to Bryan.
The ratio of Adam's to Bryan's stickers becomes 3 : 7.
- Number of stickers that Bryan has at first = _____ u
- Change in the number of stickers that Bryan has = _____ u
- Number of stickers that Adam has at first = _____ u
- Number of stickers that Adam has in the end = _____ u
|
Adam |
Bryan |
Total |
Before |
2 x 10 = 20 u |
1 x 10 = 10 u |
3 x 10 = 30 u |
Change |
- 22 |
+ 22 |
|
After |
3 x 3 = 9 u |
7 x 3 = 21 u |
10 x 3 = 30 u |
(a)
Change ratio into units.
There is an internal transfer of 22 stickers from Adam to Bryan.
The total remains unchanged.
LCM of 3 and 10 is 30.
Number of stickers that Adam gives to Bryan
= 20 u - 9 u
= 11 u
Number of stickers that Bryan has at first = 10 u
(b)
Number of stickers that Bryan has in the end = 21 u
Change in the number of stickers that Bryan has
= 21 u - 10 u
= 11 u
(c)
Number of stickers that Adam has at first = 20 u
(d)
Number of stickers that Adam has in the end = 9 u
Answer(s): (a) 10; (b) 11; (c) 20; (d) 9