Fill in the blanks in units (Eg 3 u) or unit equations (Eg 1 u + 2).

Adam, Bryan and Charlie have some stickers.
After Adam's number of stickers is doubled,
Bryan's number of stickers is increased by 10 and
Charlie's number of stickers is reduced by 8,
the ratio of the number of stickers of Adam to Bryan to Charlie becomes 8 : 7 : 6.

Let the number of stickers that Charlie has in the end be 6 u.

1. Number of stickers that Adam has at first = _____
2. Number of stickers that Bryan has at first = _____
3. Number of stickers that Charlie has at first = _____
4. Total number of stickers that they have at first = _____

	Adam	Bryan	Charlie
Before	4 u	7 u - 10	6 u + 8
Change	x 2	+ 10	- 8
After	8 u	7 u	6 u

(a)
Change information into units.

Number of stickers that Adam has at first
= 8 u ÷ 2
= 4 u

(b)
Number of stickers that Bryan has at first = 7 u - 10

(c)
Number of stickers that Charlie has at first = 6 u + 8

(d)
Total number of stickers that they have at first
= 4 u + 7 u - 10 + 6 u + 8
= 4 u + 7 u + 6 u - 10 + 8 
= 17 u - 2

Answer(s): (a) 4 u; (b) 7 u - 10; (c) 6 u + 8; (d) 17 u - 2