Fill in the blanks.
2 boys, Bryan and Adam, have some stickers.
The ratio of Bryan's to Adam's stickers is 2 : 1.
Bryan gives 28 to Adam.
The ratio of Bryan's to Adam's stickers becomes 4 : 9.

1. Number of stickers that Adam has at first = _____ u
2. Change in the number of stickers that Adam has = _____ u
3. Number of stickers that Bryan has at first = _____ u
4. Number of stickers that Bryan has in the end = _____ u

	Bryan	Adam	Total
Before	2 x 13 = 26 u	1 x 13 = 13 u	3 x 13 = 39 u
Change	- 28	+ 28
After	4 x 3 = 12 u	9 x 3 = 27 u	13 x 3 = 39 u

(a)
Change ratio into units.

There is an internal transfer of 28 stickers from Bryan to Adam.

The total remains unchanged.
LCM of 3 and 13 is 39.

Number of stickers that Bryan gives to Adam
= 26 u - 12 u
= 14 u

Number of stickers that Adam has at first = 13 u

(b)
Number of stickers that Adam has in the end = 27 u
 
Change in the number of stickers that Adam has
= 27 u - 13 u
= 14 u

(c) 
Number of stickers that Bryan has at first = 26 u

(d)
Number of stickers that Bryan has in the end = 12 u


Answer(s): (a) 13; (b) 14; (c) 26; (d) 12