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 marbles.
After Charlie's number of marbles is doubled,
Adam's number of marbles is increased by 20 and
Bryan's number of marbles is reduced by 2,
the ratio of the number of stickers of Charlie to Adam to Bryan becomes the same.

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

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

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

(a)
Change information into units.

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

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

(c)
Number of marbles that Bryan has at first = 1 u + 2

(d)
Total number of marbles that they have at first
= 0.5 u + 1 u - 20 + 1 u + 2
= 0.5 u + 1 u + 1 u - 20 + 2
= 2.5 u - 18

Answer(s): (a) 0.5 u; (b) 1 u - 20; (c) 1 u + 2; (d) 2.5 u - 18