Fill in the blanks in units, decimal units or unit equations. (Eg 3 u OR 1.2 u OR 1 u + 2)

Charlie, Adam, and Bryan have some stickers.
After Charlie's number of stickers is doubled,
Adam's number of stickers is increased by 20 and
Bryan's number of stickers is reduced by 7,
the ratio of the number of stickers of Charlie to Adam to Bryan becomes the same.

Let the number of stickers that Charlie has in the end be 1 u.

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

	Charlie	Adam	Bryan
Before	0.5 u	1 u - 20	1 u + 7
Change	x 2	+ 20	- 7
After	1 u	1 u	1 u

(a)
Change information into units.

Number of stickers that Charlie has at first
= 1 u ÷ 2
= 0.5 u

(b)
Number of stickers that Adam has at first = 1 u - 20

(c)
Number of stickers that Bryan has at first = 1 u + 7

(d)
Total number of stickers that they have at first
= 0.5 u + 1 u - 20 + 1 u + 7
= 0.5 u + 1 u + 1 u - 20 + 7
= 2.5 u - 13

Answer(s): (a) 0.5 u; (b) 1 u - 20; (c) 1 u + 7; (d) 2.5 u - 13